Question

If the unit price for watermelon is $0.24 per pound and Jared pays $1.68 for a watermelon, how many pounds does his watermelon wiegh?

Answer 1

The answer is 7 pounds.

To answer this you create a proportion like this
$\frac{0.24}{1} = \frac{1.68}{?}$
The top values represent the cost and the bottom values represent the weight in pounds

You cross multiply and divide to get 7 pounds, which is the answer

Answer 2

The watermelon weighs 7 pounds

Proof: 

remove the decimal points then divide 168 by 24

168/24 = 7

The watermelon weighs 7 pounds