How do you solve the following problems that involve percentages?

**5 is 20% of what number?**

**20% of 120 equals ?**

**5 is what percent 25?**

In each of these problems you can use the formula,

is/of =%/100

**Let’s see how this works.**

**5 is 20% of what Number?**

5/x = 20/100

Cross multiply

20x = 500

Divide by 20

x = 25

**What is 20% of 120 ?**

x/120 = 20/100

Cross multiply

100x = 2400

Divide both sides by 100

X = 24

**5 is what percent of 25?**

5/25 = x/100

Cross Multiply

25x =500

Divide both sides by 25

x = 20

This video works several similar problems. Each problem can be solved using is over of.