A number increased by 18% then decreased by 18% gives net: MCQ with Answer and Explanation

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A number increased by 18% then decreased by 18% gives net:

A. 3.24% increase

B. 2% decrease

C. 3.24% decrease

D. 0%

Answer: Option C

Solution (By JKSSB Mock Tests)

1.18 × 0.82 = 0.9676, 3.24% decrease.

This question belongs to: Maths Percentage

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Question #1

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Candidate got 40% of valid votes and lost by 3000. 25% votes invalid. Total voters:

A. 22000

B. 18000

C. 16000

D. 20000

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Correct Answer: Option D

Explanation:
Valid votes V, winner 60%V, loser 40%V, margin 20%V=3000 → V=15000. Total T, 0.75T=15000 → T=20000.

This question belongs to: Maths Percentage

Question #2

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A number is decreased by 10% and then the new number is increased by 20%. If the resulting number is 540, find the original number.

A. 500

B. 450

C. 520

D. 480

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Correct Answer: Option A

Explanation:
0.9 × 1.2 = 1.08, 1.08x = 540 → x = 500.

This question belongs to: Maths Percentage

Question #3

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In a town, 70% of people speak English, 65% speak Hindi, and 27% speak neither. What percentage of people speak both languages?

A. 70%

B. 62%

C. 60%

D. 52%

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Correct Answer: Option B

Explanation:
Speak at least one = 100% - 27% = 73%. n(E U H) = n(E) + n(H) - n(E ∩ H). 73 = 70 + 65 - n(E ∩ H). n(E ∩ H) = 135 - 73 = 62%.

This question belongs to: Maths Percentage

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