Question

A total of $4.80 consisting of dimes and quarters was collected from a soft drink vending machine. If there's one more quarter than there are dimes, find the number of dimes and the number of quarters.

A. 18 dimes; 12 quarters
B. 12 dimes; 13 quarters
C. 13 dimes; 14 quarters
D. 14 dimes; 15 quarters

Answer 1

Explanation:

multipy .10 by 18 and you get 1.80$ then 12 quarters is 3.00 so 1.80+ 3.00= 4.80

Answer 2

q = d + 1
4.80 = 0.10d + 0.25q
4.80 = 0.10d + 0.25 (d + 1)
4.80 = 0.10d + 0.25d + 0.25
4.55 = 0.35d
13 = d

C. 13 dimes, 14 quarters