Question

Reena has 12 more dimes than she does quarters. If Reena has a total of 28 coins, how many quarters, qq, and how many dimes, dd, does Reena have? Use the equations and the graph below to arrive at your answer.
q = d –12
q = 28 –d
A. 28 dimes and 12 quarters
B. 20 dimes and 8 quarters
C. 12 dimes and 28 quarters
D. 8 dimes and 20 quarters

Answer 1

Q = d - 12
q = 28 - d

d - 12 = 28 - d
d + d = 28 + 12
2d = 40
d = 40/2
d = 20 <== 20 dimes

q = d - 12
q = 20 - 12
q = 8 <== 8 quarters