Question

A. 18 is 20 percent of what number? B. 15 is 25 percent of what number? C. 12 is 30 percent of what number? D. 24 is 40 percent of what number? E. 39 is 60 percent of what number? F. 78 is 30 percent of what number? Question: Represent each as an equation with x as the unknown number, and solve.

Answer 1

a. 90

b. 60

c. 40

d. 60

e. 65

f. 260

Explanation:

a. 18*100= 1800/20=90

b. 15*100= 1500/25= 60

c. 12*100= 1200/30= 40

d. 24*100= 2400/40= 60

e. 39*100= 3900/60=65

f. 78*100= 7800/30= 260

Answer 2

18=x*.20

15=x*.25

12=x*.30

24=x*.40

39=x*.60

78=x*.30

Explanation:

To solve for x on each, divide the number on the left of the equal side by the number x is being multiplied by. For example, 18/.20=x