Use a proportion to determine the number of children age 5 in a kindergarten class if 80% of a class of 20 children are that age.

A. x=100

B. x=75

C. x=40

D. x=15

E. x=16

16 children

Step-by-step explanation:

80% of 20 children comes out to 16 children who are of age 5.

If desired, rewrite "80%" as "0.80" and use that 0.80 as the multiplier of 20:

0.80 (20 children) = 16 children.