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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?
The largest number of coins is made by using all 5-cent coins. So the largest number is 35/5=7. The smallest number of coins is made by using a combination of 25-cent coins and 10-cent coins. Note that 25+10=35 ,so the smallest number of coins is 2. We find our difference to be 7-2=5.
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