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

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

A. 200

B. 300

C. 225

D. 250

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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If the price of a book is increased by 20%, its new price is Rs. 180. Original price was:

A. 170

B. 140

C. 150

D. 160

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Correct Answer: Option C

Explanation:
Let original price be P. 1.2P = 180 → P = 150.

This question belongs to: Maths Percentage

Question #2

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0.04 as percent is:

A. 40%

B. 0.04%

C. 4%

D. 0.4%

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Correct Answer: Option C

Explanation:
0.04 × 100 = 4%.

This question belongs to: Maths Percentage

Question #3

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In a mixture, the ratio of copper to zinc is 5:3. If 20% of the mixture is removed, what percentage of the remaining mixture is copper?

A. 70%

B. 50%

C. 62.5%

D. 60%

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Correct Answer: Option C

Explanation:
Removing part of the mixture does not change the ratio. Copper proportion = 5 / (5+3) = 5/8. Percentage = (5/8) * 100 = 62.5%.

This question belongs to: Maths Percentage

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