Question

A hallway measuring 90 feet x 7 feet requires 1/2 a fluid ounce of cleaning solution per square foot. How much cleaning solution is required to clean the hallway?

Answer 1

$90*7 = 630ft ^{2} \\ \\ 1/2 floz ->1 ft^{2} \\ \\ 630/2=315 \\\\\boxed{315}$

Answer 2

First, find the area of the hallway.

$Area=length*width$

$A=90*7$

$A=630$

Now you know there are 630 square feet to be cleaned. To find the amount of cleaning solution needed, multiply this number by 1/2.

$Solution=area* \frac{1}{2}$

$S=630* \frac{1}{2}$

$S= \frac{630}{2}$

$S=315$

Answer: 315 fluid ounces