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Primary math solution (1st phase) by khairul alam
1.
Primary Assistant Teacher
Exam Question 1st Phase-24th May, 2019 Set: 5277 1. hw` †Z‡ji g~j¨ 25% e„w× cvq Z‡e †Z‡ji e¨envi kZKiv KZ Kgv‡j †Zj eve` e¨q e„w× cv‡e bv? [36Zg wewmGm] K.16% L.20% M.25% N.24% DËi:L mgvavb: 25% ‡e‡o 100 †_‡K n‡e 125 GLb LiP e„w× bv Kivi Rb¨ 100 UvKvi LiP Ki‡Z n‡e| A_©vr LiP Kgv‡Z n‡e 25 UvKv| 125 UvKvq Kgv‡Z n‡e 25UvKv ∴100 ‡Z Kgv‡Z n‡e = 125 100 25 × =20% Khairul’s Basic Math: 5th Edition: Aa¨vq: kZKiv, c„ôv b¤^i: 293, cÖkœ b¤^i: 91 ûeû| 2. x + y = 17 Ges xy= 60 n‡j, (x – y)2 Gi gvb KZ? (wkÿK wbeÜb, wcÖwjwgbvix †U÷ K‡jR ch©vq-2015) K. 49 L. 64 M. 36 N. 125 DËi: K wjwLZ mgvavb: Avgiv Rvwb(x-y)2 = (x+ y)2 - 4xy (x+y) Ges xy Gi gvb †`qv Av‡Q ZvB GB m~Î) ev, (x-y)2 = 172 - 4×60 ( gvb ewm‡q) ev, (x-y)2 = 289 - 240 ∴(x-y)2 = 49 gy‡L gy‡L Ki‡Z Gfv‡e fveyb = x+y= 17, xy = 60 [60 ‡K fv½‡j 12×5 = 60 Ges 12+5 = 17] ZvB (12- 5)2 = 72 = 49 DËi: 49 Khairul’s Basic Math: 5th Edition: Aa¨vq: gvb wbY©q, c„ôv b¤^i: 525, cÖkœ b¤^i: 14 ûeû| 3. hw` (x-y)2 = 12 Ges xy = 1 nq, Z‡e x2 +y2 = KZ? [cÖwZiÿv gš¿Yvj‡qi Aax‡b ¸ß ms‡KZ cwi`߇ii mvBevi Awdmvi: 05] K. 11 L. 12 M. 13 N. 14 DËi: N mgvavb: x2 +y2 =(x-y)2 +2xy = 12+2.1 = 12+2 = 14 Khairul’s Basic Math: 5th Edition: Aa¨vq: gvb wbY©q, c„ôv b¤^i: 527, cÖkœ b¤^i: 26 ûeû| 4. 3wU msL¨vi Mo 6 Ges H 3wU mn †gvU 4 wU msL¨vi Mo 8 n‡j PZz_© msL¨vwUi A‡a©‡Ki gvb KZ? (BBA 94-95) K.5 L.6 M.7 N.8 DËi:M mgvavb: cÖ_g 3wUi mgwó = 3×6 = 18 Avevi 4wU msL¨vi mgwó = 4×8 = 32 myZivs 4_© msL¨vwU = 32-18 = 14 Zvn‡j 4_© msL¨vwUi A‡a©K n‡e 14÷2 = 7| Khairul’s Basic Math: 5th Edition: Aa¨vq: Mo, c„ôv b¤^i: 248, cÖkœ b¤^i: 15 GKB iKg|
2.
5. a- a 1 = 3
n‡j a2 + 2 a 1 Gi gvb KZ? (gva¨:mn:cÖ:wk:-03) a.11 b.12 c.14 d.16 Ans:a Solution: a2 + 2 a 1 =a2 + 2 a 1 [ 2 a 1 ‡K 2 a 1 wjL‡j GKB gvb †evSvq ] a 1 2.a. a 1 a 2 + − = [GLv‡b a- a 1 Gi gvb ‡`qv Av‡Q ZvB (-) Gi m~ÎwU cÖ‡qvM Kiv n‡q‡Q Avi g‡b ivL‡eb †fZ‡i (-) n‡j evB‡i (+) n‡e, Ges †f‡Zi (+) n‡j evwn‡i (-) n‡e|] Khairul’s Basic Math: 5th Edition: Aa¨vq: gvb wbY©q, c„ôv b¤^i: 528, cÖkœ b¤^i: 37 ûeû| 6. mg‡KvYx wÎfz‡Ri AwZfzR msjMœ ‡KvY `ywUi cÖ‡Z¨KwU Kx†KvY n‡e? (Z_¨ gš¿Yvjq-06) DËi:-m~²‡KvY mgvavb: cv‡ki wPÎwU jÿ¨ Kiæb| ∠B = 900 wKš‘ ∠A Ges ∠C Gi gvb KZ Zv ARvbv n‡jI, ‡KvY `ywUi mgwó = 900 | myZivs G‡`i †Kvb GKwU †KvY GKvKx 900 ev Zvi †ewk n‡Z cv‡i bv,Aek¨B 900 ‡_‡K Kg n‡e| ZvB Giv n‡e my²‡KvY | Khairul’s Basic Math: 5th Edition: Aa¨vq: wÎfzR, c„ôv b¤^i: 770, cÖkœ b¤^i: 31 ûeû| 7. ‡Kvb GKwU ¯‹z‡ji wk¶K-wk¶vwqÎxi‡`i g‡a¨ Ask gwnjv, cyiæl wk¶K‡`i 12 Rb AweevwnZ Ges Ask weevwnZ| H ¯‹z‡ji wk¶K - wk¶vwqÎxi msL¨v KZ? (_vbv wk¶v Awdmvi cix¶v- 1999) K.90 L.80 M.85 N.95 DËi: K mgvavb: cÖ‡kœ cÖ`Ë 12 nj AweevwnZ cyiæ‡li msL¨v hv nj †gvU cyiæ‡li Ask (KviY weevwnZ nj Ask) Zvn‡j 1 As‡ki gvb n‡e = 30 Rb| GLb †gvU 30 Rb cyiæl nj mKj wkÿK - wkÿvwqÎxi Ask (KviY Ask gwnjv ) ZvB Avgiv wjL‡Z cvwi, Ask = 30 Rb, myZivs 1 Ask = 90 Rb DËi: 90 Rb| weKí mgvavb: †gvU = x a‡i, x. x x 5 3 3 1 12 3 2 = + + . . 90 x = ⇒ Khairul’s Basic Math: 5th Edition: Aa¨vq: fMœvsk, c„ôv b¤^i:118, cÖkœ b¤^i: 43 ûeû| 3 2 5 3 5 2 5 3 2 12 5 × 3 1 3 2 3 1 hLb (a + b) Gi gvb †`qv _vK‡e ZLb (+) Gi myÎwU cÖ‡qvM Ki‡Z n‡e wKš‘ (a − b) Gi gvb †`qv _vK‡j (-) Gi myÎwU cÖ‡qvM Ki‡Z n‡e | Shortcut: G ai‡bi gvb wbY©‡qi AsK Lye `ªæZ Ki‡Z n‡j GKUv welq g‡b ivL‡eb †h, wK‡mi gvb †`qv Av‡Q? hw` (-) Gi gvb †`qv _v‡K Zvn‡j †h gvbwU †`qv _vK‡e Zvi eM© K‡i 2 ‡hvM Ki‡Z n‡e| Avevi hw` (+) Gi gvb _v‡K Zvn‡j Zvi eM© Kivi ci 2 we‡qvM Ki‡Z n‡e| mivmwi, =32 + 2 = 9 + 2 = 11 B C A 900
3.
8. `yBwU µwgK
msL¨vi e‡M©i AšÍi 37 n‡j, msL¨v `yBwU wbb©q Ki| [7g †kÖYx Aby : 1.2] wjwLZ mgvavb: awi, µwgK msL¨v `yBwU x, (x+1) cÖkœg‡Z, (x+1)2 -x2 = 37 ⇒x2 +2x+1-x2 = 37 ⇒ 2x=37-1 ⇒2x=36 ⇒x= 2 36 ∴ x = 18 ∴ msL¨v `yBwU x = 18 Ges x+1 = 18+1=19 myZivs msL¨v `yBwU h_vµ‡g, 18 I 19| ♦kU©KvU©: eo msL¨vwU = msL¨v؇qi e‡M©i cv_©K¨ + 1 2 myZivs 2 1 37 + = 2 38 = 19 | †QvU msL¨vwUi m~Î = msL¨v؇qi e‡M©i cv_©K¨ - 1 2 myZivs 2 1 37 − = 2 36 = 18 | = 23| DËi: 19I 18 Khairul’s Basic Math: 5th Edition: Aa¨vq: msL¨v, c„ôv b¤^i:17, cÖkœ b¤^i: 72 ûeû| GUv bZzb cÖkœ 9. GKwU †mbvevwnbxi ¸`v‡g 1500 ‰mwb‡Ki 40 w`‡bi Lv`¨ gRy` Av‡Q| 13w`b ci wKQz ˆmwbK Ab¨ RvqMvq P‡j †Mj | evwK Lv`¨ Aewkó ‰mwb‡Ki Av‡iv 30 w`b Pj‡jv| KZ Rb ˆmwbK Ab¨ RvqMvq P‡j wM‡qwQj? K.150 L.210 M.125 N.200 DËi: K mgvavb: Gai‡bi AsK mvaviY wbq‡gi gZB| ïay cÖ_‡g we‡qvM K‡i wb‡Z n‡e| j¶¨ Kiæb: AsKwU‡Z 13 w`b c‡i wKQz ‰mb¨ Ab¨ RvqMvq wM‡q‡Q ej‡Z †evSvq †h H 13 w`b ch©šÍ mevB †L‡q‡Q| ZvB 40w`‡bi Lvevi K‡g n‡q †M‡Q 40-13 = 27 w`‡bi| GLb cÖ_g jvBbwU wjL‡Z n‡e 27 w`‡bi Lvevi Av‡Q = 1500 R‡bi (ˆm‡b¨i msL¨v †ei Ki‡Z e‡j‡Q ZvB Rb †k‡l) ∴1 w`‡bi Lvevi Av‡Q = 1500×27 R‡bi (27w`‡bi Lvevi 1w`‡b †L‡Z ‡ewk †jvK jvM‡e ZvB ¸Y ) ∴30 w`‡bi Lvevi Av‡Q = R‡bi (1 w`‡bi Lvevi 30w`‡b †L‡Z †jvK Kg jvM‡e ZvB fvM) = 1350Rb| GUv DËi bv| cÖ‡kœ j¶¨ Kiæb, KZRb Av‡Q †ei Ki‡Z ej‡j 1350 RbB DËi n‡Zv| wKš‘ GLv‡b DËi †ei Ki‡Z e‡j‡Q KZ Rb evB‡i †M‡Q, ZvB DËi n‡e 1500 - 1350 = 150 Rb| Khairul’s Basic Math: 5th Edition: Aa¨vq: HwKK, c„ôv b¤^i: 46, cÖkœ b¤^i: 39 ûeû | 10. GKwU AvqZvKvi †ÿ‡Îi ˆ`N©¨ I cÖ‡¯’i AbycvZ 3 t 1 Ges Dnvi cwimxgv 200 wgUvi n‡j AvqZvKvi †ÿÎwUi †ÿÎdj KZ? (NBR-2015) K. 1575 L.1775 M.1675 N.1875 DËi: N mgvavb: awi, ˆ`N©¨= 3x Ges cÖ¯’ x cÖkœg‡Z, 2(x+3x) = 200 ev, x = 25 ∴cÖ¯’=25 Ges ˆ`N©¨=3×25= 75 Zvn‡j †ÿÎdj 25×75 = 1875 ] Khairul’s Basic Math: 5th Edition: Aa¨vq: PZzfy©R, c„ôv b¤^i:792, cÖkœ b¤^i: 29 ûeû| 30 27 1500× Shortcut: 1500 - =150 30 27 1500×
4.
11. GKwU †mvbvi
Mnbvi IRb 16 MÖvg| G‡Z †mvbv I Zvgvi AbycvZ 3:1| G‡Z wK cwigvb †mvbv †gkv‡j AbycvZ 4:1 n‡e? (21Zg wewmGm) K.8MÖvg L.10MÖvg M.5MÖvg N.4MÖvg DËi:N mgvavb: ïiæ‡Z 3+1 = 4 Ask = 16 MÖvg wQj| ∴ 1 Ask = 4 16 =4 MÖvg| GUvB DËi| KviY bZzb K‡i †mvbv e„w× †c‡q‡Q 1Ask = 4 MÖvg| ‡h¸‡jv‡Z 2wU Abycv‡Z GKwU ivwki gvb Same _vK‡e ‡m¸‡jv me GB wbq‡g Lye mn‡R n‡q hv‡e| Khairul’s Basic Math: 5th Edition: Aa¨vq: Rule of Allegation, c„ôv b¤^i:475, cÖkœ b¤^i: 60 ûeû| 12. ‡Kvb we`¨vj‡q GKwU cixÿvq 70% wkÿv_x© MwY‡Z Ges 80% wkÿv_x© evsjvq cvm K‡i‡Q| wKš‘ 10% wkÿv_x© Dfq wel‡q †dj K‡i‡Q| hw` Dfq wel‡q 300 Rb wkÿv_x© cvm K‡i _v‡K, Z‡e H we`¨vj‡q KZ Rb wkÿv_x© cixÿv w`‡q‡Q? (32 Zg we‡kl wewmGm wjwLZ) .100Rb L.200Rb M.500Rb N.600Rb DËi:M mgvavb: cÖ_‡g GKwU wel‡q †d‡ji nvi †ei Kiæb, ‡Kbbv Dfq wel‡q †d‡ji nvi †`qv Av‡Q 10%| ZvB ïay MwY‡Z †dj 100-70 = 30% Ges ïay evsjvq †dj = 100-80=20% ‡gvU †dj = 30+20 -10 = 40%, GB 40% wK? GwU n‡jv †gvU †dj ( nq GK wel‡q A_ev Dfq wel‡q †dj) Zvn‡j Dfq wel‡q cvk n‡jv 100-40% = 60% | GLb GB 60% = 300 Rb †Kbbv 360 Rb n‡j Dfq wel‡q †gvU cvk Kiv wk¶v_©xi msL¨v| GLb 100% Gi gvb n‡e, 300× = 500 Rb Khairul’s Basic Math: 5th Edition: Aa¨vq: ‡mU I †fbwPÎ, c„ôv b¤^i:725, cÖkœ b¤^i: 23 ûeû| 13. GKwU †PŠev”Pvq `yÕwU bj mshy³ Av‡Q| cÖ_g bj Øviv †PŠev”PvwU 4 wgwb‡U c~Y© nq Ges wØZxq bj Øviv 12 wgwb‡U c~Y© nq| bj `yÕwU GK‡Î Ly‡j w`‡j Lvwj †PŠev”PvwU KZÿ‡Y c~Y© n‡e? [Sonali Bank.off. - 2014] K.4 L.5 M.6 N.3 DËi:N Solution: `ywU bj GKmv‡_ 1wgwb‡U c~Y© K‡i = + ⇒ Ask| Ask c~Y© n‡Z jv‡M = 1wgwbU∴1 ÕÕ ÕÕ ÕÕ ÕÕ = 1×3 = 3wgwbU| Khairul’s Basic Math: 5th Edition: Aa¨vq: bj †PŠev”Pv I KvR, c„ôv b¤^i:216, cÖkœ b¤^i: 2 ûeû| 14. `yB AsK wewkó GKwU msL¨v, AsK؇qi ¯’vb wewbg‡qi d‡j 54 e„w× cvq| AsK `ywUi ‡hvMdj 12 n‡j msL¨vwU KZ? (37-Zg wewmGm wcÖwj) (K) 57 (L) 75 (M) 39 (N) 93 DËi M mgvavb: Ackb †_‡K 39 msL¨vwUi AsKØq ¯’vb cwieZ©b Ki‡j 93 nq| hv 39 †_‡K 93-39 = 54 eo| ZvB 39-B DËi| Khairul’s Basic Math: 5th Edition: Aa¨vq: msL¨v, c„ôv b¤^i:28, cÖkœ b¤^i: 126 ûeû| 60 100 4 1 12 1 3 1 12 4 12 1 3 = = + 3 1 Ae¯’vb ‡mvbv Zvgv ïiæ‡Z wQj 3 1 ‡mvbv ‡gkv‡bvi ci 4 1 ‡mvbv †e‡o‡Q 1 Ask AcwiewZ©Z Shortcut wgwbU 3 16 12 4 12 4 12 4 = × = + ×
5.
15. cÖ`Ë Dcv˸‡jvi
ga¨K †KvbwU ? 12, 9, 15, 5, 20, 8, 25, 17, 21, 23, 11 K. 14 L. 12 M. 15 N. 13 DËi: M mgvavb: ga¨K n‡”Q µgweb¨¯Í Dcv‡Ëi ga¨c‡`i gvb| DcvË we‡Rvo msL¨K n‡j ga¨K n‡e ga¨c‡`i gvb| DcvË †Rvo msL¨K n‡j ga¨K n‡e gvSLv‡bi c` `yBwU Mo| Dcv˸‡jv‡K gv‡bi µgvbymv‡i mvRv‡j cvB = 5, 8, 9, 11, 12, 15, 17, 20, 21, 23, 25, GLv‡b, c`msL¨v = 11wU| Ges Dfq cv‡k 5wU K‡i c` ivL‡j gv‡Si c`wU n‡e 5+1 = 6ô| GLv‡b 6ó c` = 15 Khairul’s Basic Math: 5th Edition: Aa¨vq: cwimsL¨vb, c„ôv b¤^i:745, cÖkœ b¤^i: 3 m`„k 16. GKwU Køv‡mi wkÿv_©x‡`i g‡a¨ 2700 PK‡jU weZiY Kiv n‡jv| cÖ‡Z¨K wkÿv_©x K¬v‡mi †gvU wkÿv_©x msL¨vi wZb¸Y cwigvY †c‡j wkÿv_©x msL¨v KZ? (BKB Senior oofficer - 11) K. 45 L. 35 M.30 N.40 DËi:M mgvavb: awi, †gvU wkÿv_©x msL¨v = x Rb Ges cÖwZR‡bi cÖvß PK‡j‡Ui msL¨v n‡jv = 3x wU| cÖkœg‡Z, x×3x = 2700 ev, 3x2 = 2700 ev, x2 = 900 ∴x=30 myZivs †gvU wkÿv_©x msL¨v = 30Rb Khairul’s Basic Math: 5th Edition: Aa¨vq: eM© I eM©g~j, c„ôv b¤^i:155, cÖkœ b¤^i: 36 ûeû 17. 0.02 0.01 1.2 1.1 0.1 × × × -Gi gvb KZ? (cÖv_:mn:wk:-10) K.660 L.550 M.360 N.460 DËi: K mgvavb: GLv‡b `kwgK †Zvjvi ci msL¨v¸‡jv _vK‡e 2 1 10 12 11 1 × × × × wb‡P `kwg‡Ki ci 4wU msL¨v Ges Dc‡i `kwg‡Ki ci 3wU msL¨v GLb wb‡P GKwU msL¨v †ewk Av‡Q ZvB Dc‡i 10 ¸Y Kiv n‡q‡Q| GLb KvUvKvwU K‡i - DËi:- 660 Khairul’s Basic Math: 5th Edition: Aa¨vq: `kwgK I fMœvsk, c„ôv b¤^i:144, cÖkœ b¤^i: 46 ûeû 18. GKwU eM©vKvi evMv‡bi †ÿÎdj 2025 eM©wgUvi| Gi Pviw`‡K †eov Av‡Q| †eovi ‰`N¨© KZ? (mn: AvenvIqvwe`:95) K.200 L.180 M.140 N †KvbwUB bq DËi: L mgvavb: GLv‡b, ‡eovi ‰`N©¨B n‡”Q cwimxgv ZvB GKevû x n‡j, x2 =2025 ∴, x=45 Ges cwimxgv ev †eov 4x =4×45= 180 Khairul’s Basic Math: 5th Edition: Aa¨vq: PZzf©yR, c„ôv b¤^i:799, cÖkœ b¤^i: 63 ûeû
6.
19. GK e¨vw³i
RyjvB gv‡mi Avq Zvi evwK 11 gv‡mi Av‡qi mgvb n‡j, Zvi RyjvB gv‡mi Avq mviv eQ‡ii Av‡qi KZ Ask? K. L. M. N. DËi: K mgvavb: awi cÖwZ gv‡m 1 UvKv K‡i Avq K‡i, Zvn‡j 11gv‡mi Avq 11UvKv Zvn‡j RyjvB gv‡mi AvqI 11 UvKv GLb mviv eQ‡ii (12gv‡mi) Avq 11+11=22 UvKv| GLb RyjvB gv‡mi Avq mviv eQ‡ii Av‡qi Ask | Av‡iv mn‡R: RyjvB gv‡mi Avq = x UvKv n‡j Ab¨ 11 gv‡mi AvqI x UvKv| Zvn‡j eQ‡ii 12 gv‡mi †gvU Avq x+x = 2x UvKv | myZivs RyjvB gv‡mi Avq mviv eQ‡ii Av‡qi = x 2 x = 2 1 Ask | Khairul’s Basic Math: 5th Edition: Aa¨vq: fMœvsk, c„ôv b¤^i:119, cÖkœ b¤^i: 46 ûeû 20. `yB AsK wewkó †Kv‡bv msL¨vi A¼ `ywUi AšÍi 2; A¼ `ywU ¯’vb wewbgq Ki‡j †h msL¨v cvIqv hvq, Zv cª`Ë msL¨vi wظY A‡c¶v 6 Kg| msL¨vwU KZ? K.20 L.24 M.42 N †KvbwUB bq DËi: L mgvavb: awi, GKK ¯’vbxq AsKwU = x myZivs `kK ¯’vbxq A¼wU = x-2 Zvn‡j msL¨vwU n‡e, 10(x-2)+x = 10x-20+x = 11x-20 ¯’vb wewbgq Kivi ci bZzb msL¨vwU n‡e: 10x+x-2 = 11x-2 cÖkœg‡Z, 2(11x-20) = 11x-2+6 [cÖ_g msL¨vwU‡K 2¸Y Ki‡j Zv c‡ii msL¨vi †_‡K 6 eo n‡q hv‡e ZvB c‡i 6 †hvM] ⇒22x-40 = 11x+4 ⇒11x= 44 ∴x = 4 myZivs msL¨vwU = 11x-20 = 11×4-20 = 44-20 = 24 cÖgvY: 24 G 2 I 4 Gi cv_©K¨ 2 | Avevi 24 †K ¯’vb e`j Ki‡j nq 42 hv Zvi wظY 48 †_‡K 6 Kg| Khairul’s Basic Math: 5th Edition: Aa¨vq: mij mgxKiY, c„ôv b¤^i:620, cÖkœ b¤^i: 30 ûeû Khairuls Basic Math eB †_‡K kZfvM Kgb| ‡dmeyK: I BDwUDe: Khairuls Basic Math wj‡L mvP© w`b| 2 1 3 2 3 1 4 1 2 1 22 11 = wUcm: KL‡bv fMœvsk mvRv‡Z ej‡j hvi mv‡_i,Gi wefw³ hy³ _v‡K ‡mB msL¨vwU‡K wb‡P wj‡L Aci msL¨vwU‡K Dc‡i wjL‡Z nq, Ges †k‡l KvUvKvwU K‡i †h fMœvsk ˆZix nq Zv-B DËi|