In a college, 40% are girls. 50% of the boys and 60% of the girls passed an exam. If 460 students failed, find the total number of students. MCQ with Answer and Explanation

In a college, 40% are girls. 50% of the boys and 60% of the girls passed an exam. If 460 students failed, find the total number of students.

A. 1100

B. 800

C. 900

D. 1000

Answer: Option D

Total T. Boys=0.6T, girls=0.4T. Passed=0.5×0.6T+0.6×0.4T=0.3T+0.24T=0.54T. Failed=0.46T=460 → T=1000.

This question belongs to: Maths Percentage

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Question #1 Report Error

A's salary 15% less than B's. By what % must A's salary be raised to equal B's?

A. 18%

B. 15%

C. 17.65%

D. 16.67%

Correct Answer: Option C

Explanation:
A=85, B=100. Increase needed = (15/85)×100 ≈ 17.65%.

This question belongs to: Maths Percentage

Question #2 Report Error

40% of a number is 60. 80% of that number is:

A. 100

B. 120

C. 130

D. 110

Correct Answer: Option B

Explanation:
Number = 60/0.4 = 150, 80% of 150 = 120.

This question belongs to: Maths Percentage

Question #3 Report Error

A's salary is 30% less than B's. If B's salary is 6000, A's salary is:

A. 4500

B. 3900

C. 4200

D. 4000

Correct Answer: Option C

Explanation:
A's salary = 6000 × 0.7 = 4200.

This question belongs to: Maths Percentage