Pedro bought 5 packages of stickers. Each package contained 4 stickers. So Pedro bought a total of 5 * 4 = 20 stickers. The document asks the reader to solve math word problems involving addition, subtraction, and sequences. It asks the reader to determine the total number of stickers Pedro bought, how many stickers someone would have if they gave 15 of their 29 stickers away, and how many bicycles can be made with 18 wheels.