SOLUTION: If all Marsha's dimes were quarters, she would be 90 cents richer. How many dimes does she have?

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Question 27797: If all Marsha's dimes were quarters, she would be 90 cents richer. How many dimes does she have?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Let number of coins be "x".
Value if dimes = 10x cents
Value if quarters = 25x cents
EQUATION:
Value if quarter = Value if dimes + 90
25x=10x+90
15x=90
x=6 (number of coins)
Cheers,
Stan H.