SOLUTION: Twenty-five coins, a combination of dimes and quarters, are worth $4.75. How many coins are dimes? How many are quarters?

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Question 342251: Twenty-five coins, a combination of dimes and quarters, are worth $4.75. How many coins are dimes? How many are quarters?
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
let number of dimes be d
quarters will be 25-d
..
total value = 475 cents
10d+25(25-d)=475
10d+625-25d=475
-15d=475-625
-15d=-150
divide by -15
d= 10 the number of dimes
quarters will be 15
CHECK
15*25+10*10=475