Question

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

Answer 1

$7.50
$10/8=1.25
6x1.25=$7.50

Answer 2

7.50

Explanation:

We can use proportions to solve

8 batteries 6 batteries

------------------ = ------------------

10 dollars x dollars

Using cross products

8x = 6*10

8x = 60

Divide each side by 8

8x/8 = 60/8

x =7.50