Directions : Read the following information carefully and answer the…
2019
Directions : Read the following information carefully and answer the questions.
There are some students (male + female) in Class A and Class B in CCA School. In class A, females are 30% of total students of class A. In class B, number of male and female students are equal and male students in class B are thrice the number of female students of Class A.
If 10% of male students and 20% of female students from Class A left the school and male and female students in class B increased by 25% and 30% respectively, then total male students of Class A and B together are approximately what percent of total students of Class A and B together?
- A.
55.45%
- B.
45.45%
- C.
55.15%
- D.
45.15%
- E.
50%
Show answer & explanation
Correct answer: A
Let Class A total be T. Initially Class A males = 0.7T and females = 0.3T; Class B males = females = 0.9T. After the changes, total males = 0.7T x 90% + 0.9T x 125% = 1.755T. Total students = 0.63T + 0.24T + 1.125T + 1.17T = 3.165T. The male percentage is 1.755/3.165 x 100 = 55.45% approximately.