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

Answer:

12 students should like blue

Step-by-step 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