Question

In a primary school, 10% of students are below 11 years of age. The number of students above 11 years of age is 3/4 of the number of students of 11 years of age which is 36. What is the total number of students in the school? ( A ) 80 ( B ) 72 ( C ) 150 ( D ) 70

Answer 1

Answer:

D) 70.

Step-by-step explanation:

Let total number of students = x.

Number of students below 11 years of age = 10% of x = 0.1 x.

Number of students who are exactly 11 years of age = 36.

Number of students who are above 11 years of age = x - (0.1x + 36)  = 0.9x - 36.

given, number of students above 11 years of age is 3/4 of the number of students of 11 years of age which is 36.

=> 0.9x - 36  = 3/4 * 36

=> 0.9x = 27 + 36

=> 0.9x = 63

=> x = 63/0.9 = 70.