If 20% of a number is 45, what is the number? MCQ with Answer and Explanation

If 20% of a number is 45, what is the number?

A. 250

B. 300

C. 225

D. 200

Answer: Option C

Let the number be x. (20 / 100) * x = 45 implies x = 45 * 5 = 225.

This question belongs to: Maths Percentage

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Question #1 Report Error

The price of an article is increased by 25% and then decreased by x%. If the net effect is no change, find x.

A. 30

B. 25

C. 22.5

D. 20

Correct Answer: Option D

Explanation:
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.

This question belongs to: Maths Percentage

Question #2 Report Error

If the length of a rectangle is increased by 20% and the breadth is decreased by 10%, what is the percentage change in area?

A. 8% increase

B. 12% increase

C. 6% increase

D. 10% increase

Correct Answer: Option A

Explanation:
1.2 × 0.9 = 1.08, 8% increase.

This question belongs to: Maths Percentage

Question #3 Report Error

Increase 500 by 10%. Result is:

A. 505

B. 550

C. 510

D. 600

Correct Answer: Option B

Explanation:
500 × 1.1 = 550.

This question belongs to: Maths Percentage