A number is increased by 15% and then decreased by 20%. The result is 276. Find the original number. MCQ with Answer and Explanation

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A number is increased by 15% and then decreased by 20%. The result is 276. Find the original number.

A. 280

B. 250

C. 320

D. 300

Answer: Option D

Solution (By JKSSB Mock Tests)

1.15 × 0.8 = 0.92, 0.92x = 276 → x = 300.

This question belongs to: Maths Percentage

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Question #1

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Office 60% men. 70% of men and 50% of women have car. % of workers with car:

A. 60%

B. 64%

C. 62%

D. 58%

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Correct Answer: Option C

Explanation:
Men with car = 42% of total, women = 20%, total 62%.

This question belongs to: Maths Percentage

Question #2

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Population of a city is 80,000, increasing at 15% per year. After 1 year, population is:

A. 94,000

B. 92,000

C. 90,000

D. 88,000

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Correct Answer: Option B

Explanation:
80,000 × 1.15 = 92,000.

This question belongs to: Maths Percentage

Question #3

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A student multiplied a number by 2/3 instead of 3/2. What is the percentage error?

A. 66.66%

B. 50%

C. 55.55%

D. 44.44%

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Correct Answer: Option C

Explanation:
True = 3/2x. False = 2/3x. Error = (3/2 - 2/3)x = (5/6)x. % Error = ((5/6) / (3/2)) * 100 = (10/18) * 100 = 55.55%.

This question belongs to: Maths Percentage

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