Question

3 gallons of paint cover 900 square feet. How many gallons will cover 300 square feet?

• A. 3 gallons
• B. 1 gallon
• C. 4 gallons
• D. 7 gallons

Answer 1

The correct option is B 1 gallon

It requires 3 gallons of paint to cover 900 square feet.
We have to determine the amount of paint required to cover 300 square feet.

Let us suppose it requires $x$ gallons to cover 300 square feet.

So, we can say that,
$3,900,x,$ and $300$ are in proportion.

It can be written as follows:
$3:900::x:300$
$\Rightarrow \frac{3}{900}=\frac{x}{300}$

Using cross multiplication, we get,
$\Rightarrow x\times 900=3\times 300$
$\Rightarrow 900x=900$
$\Rightarrow x=\frac{900}{900}$
$\Rightarrow x=1$

Hence, 1 gallon of paint is required to cover 300 square feet.