Question

Paul owes Paula 35 cents and has a pocket full of 5-cent coins, 10-cent coins, and 25-cent coins that he can use to pay her. What is the difference between the largest and the smallest number of coins he can use to pay her?
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Answer 1

the smallest number of coins they can use is 2: a 25 cent coin and a 10 cent coin. It can't be less, since there is no 35 cent coin.

The largest amount of coins is by using the smallest coins: only 5 cent coins, which would mean 7 of them, since 7*5=35

and the difference is 5: 7-2=5.