Question

5. The custodians at school must sanitize all the desks in the building each night. If there are 3,500 desks in the entire school building and the custodians have cleaned 1,400 desks by the time Ms. Burlingame leaves at 3:30pm, what percent of the desks have the custodians cleaned?

Answer 1

The cleaned desks is 40%.

Given:

Total number of desks is, N = 3500.

Number of desks cleaned is, C = 1400.

The objective is to find the percentage of cleaned desks.

Consider the percentage as x.

Then, the equation can be represented as,

$\begin{gathered} \frac{x}{100}\cdot3500=1400 \\ \frac{x}{100}=\frac{1400}{3500} \\ x=\frac{14}{35}\cdot100 \\ x=40 \end{gathered}$

Hence, the percentage of cleaned desks is 40%.