Kelsey had 3 times the number of quarters (25 cents) in her bag than dimes (10 cents).

Question

a. If she had a total of 68 coins, how many of them were quarters?

b. What was the total dollar value of these coins?

Answer 1

Q= 3D

Q -3D = 0

Q+D = 68

Q-3D = 0

subtract to eliminate one variable

4D = 68

D = 68/4 = 17 dimes

Q = 3(17) = 51 quarters

total value = .25(51) + .10(17) = $12.75 + $1.70 = $14.45