Carina has twice as many quarters as dimes. If she has $3.60,

how many quarters does she have?

2 answers

q = 2d
25q+10d = 360
q = 2 d

.25 q + .10 d = 3.6

.25(2 d) + .1 d = 3.6

.6 d = 3.6

6 d = 36

d = 6
so q = 12