Question

use the basic proportion p/100=a/b to solve the following problem for the uknown quantity. round your answer to the nearest tenth if necessary __% of 21 is 7

Answer 1

You know the basic proportion:

$\frac{P}{100}=\frac{A}{B}$

Where "P" is percent, "A" is the amount and "B" is the base.

You need to find the percent of 21 that represents 7. Let be "P" this percent you must find.

In this case, you can identify that:

$\begin{gathered} A=7 \\ B=21 \end{gathered}$

Then, substituting values and solving for "P", you get:

$\begin{gathered} \frac{P}{100}=\frac{7}{21} \\ \\ P=(\frac{7}{21})(100) \end{gathered}$$P\approx33.3$

Hence, the answer is: 33.3% (approximately)