By what percent is 80 less than 100? MCQ with Answer and Explanation

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By what percent is 80 less than 100?

A. 20%

B. 15%

C. 25%

D. 10%

Answer: Option A

Solution (By JKSSB Mock Tests)

Difference = 20, % = (20/100)×100 = 20%.

This question belongs to: Maths Percentage

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Question #1

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Population increases 6% annually. Present 1,50,000, after 2 years population:

A. 1,68,540

B. 1,75,000

C. 1,65,000

D. 1,70,000

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Correct Answer: Option A

Explanation:
1,50,000 × 1.06² = 1,68,540.

This question belongs to: Maths Percentage

Question #2

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In a mixture of 70 litres, the ratio of milk to water is 5:2. How much water must be added to make the ratio 2:3?

A. 45 L

B. 60 L

C. 55 L

D. 50 L

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Correct Answer: Option C

Explanation:
Milk = (5/7)×70 = 50 L, water = 20 L. For milk:water = 2:3, water = (3/2)×50 = 75 L. Add 75-20 = 55 L.

This question belongs to: Maths Percentage

Question #3

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The present population of a town is 10,890. If it increases by 10% yearly, what was its population 2 years ago?

A. 9500

B. 9000

C. 10000

D. 8000

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Correct Answer: Option B

Explanation:
P_past = P_present / (1 + R/100)^2 = 10890 / (1.10)^2 = 10890 / 1.21 = 9000.

This question belongs to: Maths Percentage

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