Question 75294
Let x=number of quarters
Then x+3=number of dimes

--Lets deal in pennies to keep life simple----

We are told that the value of the dimes 10(x+3) plus the value of the quarters 25x equals 170 (remember, we are dealing in pennies).  So, our equation to solve is:

10(x+3)+25x=170  get rid of parens
10x+30+25x=170  subtract 30 from both sides

10x+30-30+25x=170-30  collect like terms

35x=140  divide both sides by 35
x=4--------------------------------------------# of quarters

x+3=4+3=7---------------------------------------# dimes

CK
25*4+7*10=170
100+70=170
170=170


Hope this helps----ptaylor