A number is increased by 40% and then decreased by 40%. If the resulting number is 84, find the original number. MCQ with Answer and Explanation

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A number is increased by 40% and then decreased by 40%. If the resulting number is 84, find the original number.

A. 110

B. 100

C. 90

D. 120

Answer: Option B

Solution (By JKSSB Mock Tests)

1.4 × 0.6 = 0.84, 0.84x=84 → x=100.

This question belongs to: Maths Percentage

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Question #1

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In an election, 20% voters did not vote. Winner got 48% of total votes and won by 2400 votes. Total voters:

A. 15000

B. 18000

C. 10000

D. 12500

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Correct Answer: Option A

Explanation:
Votes cast = 80%. Winner got 48% of total, loser got 80% - 48% = 32% of total. Margin = 48% - 32% = 16% of total = 2400 → total = 2400/0.16 = 15000.

This question belongs to: Maths Percentage

Question #2

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Price of pen up 15%. By what % reduce consumption so that expenditure rises only 5%?

A. 9.09%

B. 8.7%

C. 8%

D. 10%

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Correct Answer: Option B

Explanation:
1.15 × x = 1.05 → x = 1.05/1.15 ≈ 0.91304, reduction = 8.7%.

This question belongs to: Maths Percentage

Question #3

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Number of boys 20% more than girls, total 88. Number of boys:

A. 52

B. 48

C. 44

D. 40

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Correct Answer: Option B

Explanation:
Girls = x, boys = 1.2x, total 2.2x=88 → x=40, boys=48.

This question belongs to: Maths Percentage

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