Question

Dexter has 40 dimes and quarters. He has $5.20. How many quarters does he have?

How many dimes does he have?

Answer 1

Explanation:

32 dimes

8 quarters

Answer 2

dimes = 32

quarters = 8

Explanation:

set up a system of equations:

let d = # of dimes

let q = # of quarters

d + q = 40

.10d + .25q = 5.2

substitution method; let 'q' = 40 - d

.10d + .25(40 - d) = 5.2

.10d + 10 - .25d = 5.2

-.15d = -4.8

d = 32

q = 40 - 32 = 8