On a math test, 12 students earned an a. this number is exactly 25% of the totalnumber of students in the class. how many students are in the class?
a. 15b. 16c. 21d. 30e. 48

Work Shown:

x = number of students in the class

25% of x = (25/100)*x = 0.25x = number of students who got an A

0.25x = 12

x = 12/0.25 divide both sides by 0.25

x = 48

Alternative Method

part/whole = percent/100

12/x = 25/100

12*100 = 25*x cross multiply

1200 = 25x

25x = 1200

x = 1200/25 divide both sides by 25

x = 48

answer: i think it is c

answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.