65% passed an exam. Failures = 420. Total examinees: MCQ with Answer and Explanation

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65% passed an exam. Failures = 420. Total examinees:

A. 1200

B. 1100

C. 1000

D. 1300

Answer: Option A

Solution (By JKSSB Mock Tests)

35% = 420, total = 420/0.35 = 1200.

This question belongs to: Maths Percentage

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Question #1

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

A. 300

B. 250

C. 320

D. 280

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Correct Answer: Option A

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

This question belongs to: Maths Percentage

Question #2

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If A is 25% less than B, then B is what percentage more than A?

A. 20%

B. 50%

C. 25%

D. 33.33%

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Correct Answer: Option D

Explanation:
Formula: (25 / 75) * 100 = (1 / 3) * 100 = 33.33%.

This question belongs to: Maths Percentage

Question #3

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In a town, the population increases by 20% during the first year and decreases by 20% during the second year. If the net change in population is a decrease of 400, find the initial population.

A. 8000

B. 9000

C. 10000

D. 12000

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Correct Answer: Option C

Explanation:
Net multiplier = 1.2 × 0.8 = 0.96, decrease 4% = 400 → initial = 400/0.04 = 10000.

This question belongs to: Maths Percentage

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