A jar contains $34.75 in quarters and dollar coins. If the number quarters is three more than four times the number of dollars, determine the number of each type of coin.

Answer 1

let's see what they say:

.25q + 1.00d = 34.75
q = 3+4d

Now just plug in q and you have

.25(3+4d) + d = 34.75
.75 + 2d = 34.75
d = 17
so, q = 3+4d = 71