SOLUTION: An old jar of dimes and quarters contains 200 coins total, and the value of all the coins is $42.50. How many quarters are in the jar? A. 50 B. 130 C. 127 D. 150

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Question 1127434: An old jar of dimes and quarters contains 200 coins total, and the value of all the coins is $42.50. How many quarters are in the jar?
A. 50
B. 130
C. 127
D. 150
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

To answer the question, you DO NOT NEED to solve full scale coin problem.



It is enough simply to substitute given data into the total money expression formula


    total money = 25*Q + 10*(200-Q),


calculate the cents amount and compare with the given options.



Even a second grade student, not familiar with solving equations yet, can do it EASILY.