PLEASE HURRY AND HELP ME WITH THIS!

Question

In Kendra’s class, 40 percent of the students earned an A on the math test. Twenty students earned an A. Kendra needs to find out how many students are in her class. Kendra’s work is shown below.



What mistake did Kendra make?   

Kendra should have multiplied by 4 in both the numerator and the denominator.

Kendra should have divided by 2 instead of multiplying by 2 in the denominator.

Kendra should have added 40 and 20.

Kendra should have the part to whole equation written as .

A.

B.

C.

D.

Answer 1

40/100=20/?; 40÷2=20; 100÷2=50; 20/50=40/100. Number of students=50.

Kendra should have divided the denominator by 2 (as well as the numerator), answer B.

20 students is 40% of 50. 40/100*50=4/10*50=2/5*50=2*10=20.