Question

Marlo uses 252 lb of gravel to cover a garden plot of 36 ft2. How many pounds of gravel does it take to cover one square foot? How large an area could be covered with 315 lb of gravel?

Answer 1

The area and the amount of gravel are illustrations of proportions.

7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.

The given parameters are:

$252\ lb= 36ft^2$

The number of pound for an area of 1 square foot is calculated as follows:

$x = 1ft^2$

So, we have:

$x = 1ft^2$

$252\ lb= 36ft^2$

Cross multiply

$x \times 36 = 252 \times 1$

Divide both sides by 36

$x = 7lb$

The area to be covered with 315lb gravel is calculated as follows:

$315lb = y$

So, we have:

$315lb = y$

$252\ lb= 36ft^2$

Cross multiply

$y \times 252 = 36 \times 315$

$y \times 252 = 11340$

Divide both sides by 252

$y = 45$

Hence, 7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.

Read more about proportions at:

brainly.com/question/13114933