Population 15000, first year +10%, second year -10%. Population after 2 years: MCQ with Answer and Explanation

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Population 15000, first year +10%, second year -10%. Population after 2 years:

A. 15100

B. 15000

C. 14850

D. 14900

Answer: Option C

Solution (By JKSSB Mock Tests)

15000×1.1×0.9 = 14850.

This question belongs to: Maths Percentage

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Question #1

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If 40% of a number is added to another, second becomes 120% of itself. Ratio of first to second:

A. 1:3

B. 1:2

C. 3:2

D. 2:3

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Correct Answer: Option B

Explanation:
0.4F + S = 1.2S → 0.4F = 0.2S → F/S = 0.2/0.4 = 1/2.

This question belongs to: Maths Percentage

Question #2

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Price of an article reduced by 15%, new price Rs. 170. Original price was:

A. 205

B. 190

C. 195

D. 200

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Correct Answer: Option D

Explanation:
Original × 0.85 = 170 → original = 200.

This question belongs to: Maths Percentage

Question #3

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A can do a work in 15 days and B in 20 days. They work together for 6 days, then A leaves. In how many more days will B finish the remaining work?

A. 5 days

B. 8 days

C. 6 days

D. 4 days

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Correct Answer: Option C

Explanation:
Work done in 6 days = 6×(1/15+1/20)=6×(7/60)=7/10. Remaining=3/10. B's rate=1/20, time = (3/10)×20=6 days.

This question belongs to: Maths Percentage

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