A number is increased by 20% and then decreased by 25%. The result is 36 less than the original. Find the original number. MCQ with Answer and Explanation

Question

A number is increased by 20% and then decreased by 25%. The result is 36 less than the original. Find the original number.

A. 360

B. 320

C. 400

D. 300

Answer: Option A

Solution (By JKSSB Mock Tests)

1.2 × 0.75 = 0.9. 0.9x = x - 36 → 0.1x = 36 → x = 360.

This question belongs to: Maths Percentage

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Question #1

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A number divided by 5, quotient increased by 20% then decreased by 20% gives 480. Number:

A. 2000

B. 2500

C. 2200

D. 2400

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Correct Answer: Option B

Explanation:
(N/5)×1.2×0.8=480 → (N/5)×0.96=480 → N/5=500 → N=2500.

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Question #2

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5/8 expressed as percent is:

A. 60%

B. 67.5%

C. 62.5%

D. 65%

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Correct Answer: Option C

Explanation:
(5/8)×100 = 62.5%.

This question belongs to: Maths Percentage

Question #3

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In a mixture of 80 litres, the ratio of milk to water is 3:2. How much water must be added to make the ratio 1:2?

A. 60 L

B. 64 L

C. 72 L

D. 80 L

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Correct Answer: Option A

Explanation:
Milk = 48 L, water = 32 L. For milk:water = 1:2, water needed = 96 L, add 64 L? Wait, 48:96 = 1:2, so add 64 L. Option B 64 L. So answer B.

This question belongs to: Maths Percentage

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