Question

there are nickels, dimes, and quarters in a piggy bank. altogether, the coins are worth $3.65. the number of dimes is three times greater than the number of nickels, and the number of quarters is one greater than double the number of nickels. how many quarters, nickels, and dimes are there?

Answer 1

4 nickels

12 dimes

9 quarters

Explanation:

x = number of nickels

y = number of dimes

z = number if quarters

0.05×x + 0.1×y + 0.25×z = 3.65

y = 3x

z = 2x + 1

0.05x + 0.1×3x + 0.25×(2x + 1) = 3.65

5x + 30x + 25×(2x + 1) = 365

35x + 50x + 25 = 365

85x = 340

x = 340/85 = 4

y = 3×4 = 12

z = 2×4 + 1 = 9