Robert has 12 coins totaling $1.45. None of his coins is larger than a quarter. Which of the following cannot be the number of quarters he has?

(1) Answers

The correct answer is 1 because coin • number = total value. When p = the number of pennies,       n = the number of nickels,       d = the number of dimes,       q = the number of quarters. The total number of coins = p+ n+ d+ q = 12. But if q = 1 then p+ n+ d = 11

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