If a number increased by 25% is 150, what is the original number? MCQ with Answer and Explanation

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If a number increased by 25% is 150, what is the original number?

A. 100

B. 120

C. 130

D. 110

Answer: Option B

Solution (By JKSSB Mock Tests)

Let the number be x. x * 1.25 = 150. x = 150 / 1.25 = 120.

This question belongs to: Maths Percentage

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Question #1

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In a mixture of 70 litres, the ratio of milk to water is 5:2. How much water must be added to make the ratio 2:3?

A. 45 L

B. 55 L

C. 60 L

D. 50 L

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Correct Answer: Option B

Explanation:
Milk = (5/7)×70 = 50 L, water = 20 L. For milk:water = 2:3, water = (3/2)×50 = 75 L. Add 75-20 = 55 L.

This question belongs to: Maths Percentage

Question #2

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In an exam, 40% failed in Physics, 30% in Chemistry, and 20% in both. If 250 students passed in both, the total number of students is:

A. 500

B. 400

C. 450

D. 550

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Correct Answer: Option A

Explanation:
Failed in at least one = 40+30-20=50%, passed both = 50% = 250 → total = 500.

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Question #3

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If the price of rice decreases by 20%, by what percentage can consumption be increased without changing expenditure?

A. 33.33%

B. 30%

C. 25%

D. 20%

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Correct Answer: Option C

Explanation:
Required increase = (R / (100 - R)) * 100. (20 / 80) * 100 = 25%.

This question belongs to: Maths Percentage

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