Question

At school,the teacher surveyed the color preferences of 21 students.Out of every 7 students surveyed,4 said they liked blue the best.How many students said their favorite color was blue?

Answer 1

12 students should like blue

Explanation:

This is a proportion. A proportion is two equal ratios. There are 4 parts to a proportion -- 3 are given. We have to solve to get the fourth.

4/7 = x/21 Cross multiply

7x = 84 Divide by 7

7x/7 = 84/7

x = 12