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?

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