20 is what percent of 80? MCQ with Answer and Explanation

20 is what percent of 80?

A. 20%

B. 30%

C. 25%

D. 35%

Answer: Option C

(20/80)×100 = 25%.

This question belongs to: Maths Percentage

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Question #1 Report Error

In a mixture of 120 litres, the ratio of milk and water is 2:1. How much water is added to change the ratio to 1:2?

A. 120 L

B. 130 L

C. 100 L

D. 110 L

Correct Answer: Option A

Explanation:
Milk=80, water=40. For 1:2, water=160, add 120 L.

This question belongs to: Maths Percentage

Question #2 Report Error

A number is decreased by 10% and then the new number is increased by 20%. If the resulting number is 540, find the original number.

A. 500

B. 480

C. 450

D. 520

Correct Answer: Option A

Explanation:
0.9 × 1.2 = 1.08, 1.08x = 540 → x = 500.

This question belongs to: Maths Percentage

Question #3 Report Error

A man's salary was reduced by 50% and then increased by 50%. Find the net change in his salary.

A. 15% decrease

B. 25% decrease

C. 40% decrease

D. 30% decrease

Correct Answer: Option B

Explanation:
0.5 × 1.5 = 0.75, 25% decrease.

This question belongs to: Maths Percentage