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. 14850

C. 14900

D. 15000

Answer: Option B

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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65% of a number is 21 less than 80%. Number is:

A. 150

B. 140

C. 120

D. 130

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Correct Answer: Option B

Explanation:
0.8x - 0.65x = 21 → 0.15x = 21 → x = 140.

This question belongs to: Maths Percentage

Question #2

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A sum of money at compound interest doubles in 5 years. How many years will it take to become 8 times?

A. 10 years

B. 20 years

C. 15 years

D. 12 years

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Correct Answer: Option C

Explanation:
2^3=8. Since doubles in 5 years, 8 times = 3 intervals of 5 = 15 years.

This question belongs to: Maths Percentage

Question #3

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Two alloys have copper 70% and 40%. Mixed to get 55% copper. Ratio of mixing:

A. 2:1

B. 3:2

C. 1:1

D. 1:2

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Correct Answer: Option C

Explanation:
Alligation: (70-55):(55-40) = 15:15 = 1:1.

This question belongs to: Maths Percentage

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