30% of the students in a maths class received 'A'.if 18 students received 'A' what is the total number of children in the class

Question

30% of the students in a maths class received 'A'.if 18 students received 'A' what is the total number of children in the class

Answer 1

Work this as a proportion:

 

n = number of students in the class

 

30/100 = 18/n

 

n = 18(100/30) = 60

 

Test the answer:

 

30% 0f 60 is 0.30(60) = 18  [good]