Question

Lisa is fertilizing her garden. The garden is in the shape of a rectangle. Its length is 12 feet and its width is 10 feet. Suppose each bag of fertilizer covers 30

square feet. How many bags will she need to cover the garden?

Answer 1

4 bags

Explanation:

The number of required bags can be found by dividing the coverage required by the coverage per bag.

Area

The area of Lisa's garden is given by the formula ...

A = LW

For the given dimensions, the area is ...

A = (12 ft)(10 ft) = 120 ft²

Bags

The number of required bags can be found by dividing the area by the area per bag:

(120 ft²)/(30 ft²/bag) = 4 bags

Lisa will need 4 bags of fertilizer to cover the garden.

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Additional comment

The multiplication relation corresponding to this division relation is ...

(bags) × (area/bag) = area

To get the relation we used above, we divided both sides by (area/bag).