Question 190528
Bill has 4 times as many quarters as dimes in all he has is 2 dollars and twenty cents how many coins each of type does he have? 
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Let # of dimes be "x" ; value is 10x cents
Then # of quarters is "4x"; value is 25*4x = 100x cents

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Value Equation:
value + value = value
10x+100x =220 cents
110x = 220
x = 2    (# of dimes)
4x = 8   (# of quarters)
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Cheers,
Stan H.