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Kelly has $16 to buy 4 candy bars. To solve this proportions problem, we set up the equation: 16/x = 4/1. Cross multiplying and solving for x gives the cost of each candy bar as $4. Since Kelly is buying 4 candy bars at $4 each, the total cost is 4 * $4 = $16. Therefore, Kelly will have $16 - $16 = $0 change left over.



