In this year's

7

th

7th

grade class, there are 4 boys for every 5 girls. How many girls are in the class if there are 20 boys in the class?

The answer to your question is 25 girls

Step-by-step explanation:

Data

4 boys for every 5 girls

20 boys? number of girls

To solve this problem use proportions

Number of boys : Number of girls : : New number of boys : New number of

girls

Substitution

4 : 5 : : 20 : x

Solve for x

x = (5 x 20) / 4

Simplification

x = 100 / 4

Result

x = 25

There are 25 girls