Question

abby has 39 coins, consisting only of dimes and quarters, worth $7.35. how many dimes and how many quarters does she have?

Answer 1

see below

Explanation:

dimes = 0.1 x dimes

quarters =0.25 y quarters

x*0.1 + y*0.25 =7.35

x+y =39 so x = 39-y

(39-y)*0.1 +0.25y =7.35

3.9-0.1y+0.25y=7.35

0.15y = 3.45

y=23

x=16