Question

At the market, 8 batteries cost $10.
How much do 6 batteries cost?

Answer 1

$7.50

Explanation:

Set up a proportion and cross multiply to find your answer.

8 batteries/$10 = 6 batteries/$x

x = (6)(10)/8

x = 60/8

x = $7.50

Answer 2

$7.50

Explanation:

1 battery costs 10/8=5/4 dollars

(5/4)*6=15/2

15/2=7.50