SOLUTION: An old jar of dimes and quarters contains 200 coins total, and the value of all the coins is $24.50. How many quarters are in the jar? A. 50 B. 130 C. 127 D. 150

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Question 1127429: An old jar of dimes and quarters contains 200 coins total, and the value of all the coins is $24.50. How many quarters are in the jar?
A. 50
B. 130
C. 127
D. 150
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
d + q = 200 therefore d = 200-q
0.10d + 0.25q = 24.50 substitute for d:
0.10(200-q) + 0.25q = 24.50
20 - 0.10q + 0.25q = 24.50
0.15q = 4.50
q = 30 there are 30 quarters in the jar