The ratio of boys to girls in a class is 3:2. If 10% of boys and 15% of girls are absent, what fraction of the total students are present? MCQ with Answer and Explanation

The ratio of boys to girls in a class is 3:2. If 10% of boys and 15% of girls are absent, what fraction of the total students are present?

A. 22/25

B. 33/50

C. 17/25

D. 87/100

Answer: Option A

Total = 5k. Present boys=0.9×3k=2.7k, girls=0.85×2k=1.7k, present=4.4k. Fraction = 4.4/5 = 44/50 = 22/25.

This question belongs to: Maths Percentage

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Question #1 Report Error

A's salary is 20% less than B's salary. By what percent is B's salary more than A's?

A. 27.5%

B. 22.5%

C. 20%

D. 25%

Correct Answer: Option D

Explanation:
Let B=100, A=80. B is (20/80)×100 = 25% more than A.

This question belongs to: Maths Percentage

Question #2 Report Error

A can do a piece of work in 20 days. B is 25% more efficient than A. How many days will B alone take to do the work?

A. 16 days

B. 14 days

C. 15 days

D. 18 days

Correct Answer: Option A

Explanation:
Efficiency ratio A:B = 100:125 = 4:5. Time ratio = 5:4. B's time = (4/5)×20 = 16 days.

This question belongs to: Maths Percentage

Question #3 Report Error

A student gets 180 marks and fails by 30 marks. The passing percentage is 35%. What is the total marks?

A. 600

B. 500

C. 700

D. 800

Correct Answer: Option A

Explanation:
Passing marks = 180 + 30 = 210. 35% of Total = 210. Total = 210 * (100 / 35) = 600.

This question belongs to: Maths Percentage