Question

Toby has 15 coins totaling $2.85. He has only quarters and dimes. How many of each type coin does he have?

Answer 1

A) D + Q = 15
B) .10 D + .25Q = 2.85
Multiplying equation A by -.10
A) -.10 D -.10 Q = -1.5 Then adding this to B)
B) .10 D + .25Q = 2.85
.15Q = 1.35
9 Quarters
and if there are 15 coins there are 6 dimes