90 L mixture, 15% water. Water added to make 40%: MCQ with Answer and Explanation

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90 L mixture, 15% water. Water added to make 40%:

A. 36 L

B. 37.5 L

C. 33.75 L

D. 40 L

Answer: Option B

Solution (By JKSSB Mock Tests)

Water=13.5 L, milk=76.5 L. For milk 60%, total = 76.5/0.6 = 127.5 L, add 37.5 L.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

A's income 30% less than B, B's 20% less than C. C's income is what % more than A's?

A. 78.57%

B. 72.5%

C. 66.67%

D. 80%

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Correct Answer: Option A

Explanation:
A=0.7B, B=0.8C → A=0.56C → C = A/0.56, more = (0.44/0.56)×100 = 78.57%.

This question belongs to: Maths Percentage

Question #2

Population of a town is 1,32,300 now. Increased 5% annually. Population 2 years ago:

A. 1,20,000

B. 1,15,000

C. 1,18,000

D. 1,22,000

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Correct Answer: Option A

Explanation:
Pop 2 years ago = 132300 / (1.05)² = 132300 / 1.1025 = 1,20,000.

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Question #3

If x is 50% of y, what percentage of x is y?

A. 150%

B. 100%

C. 250%

D. 200%

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Correct Answer: Option D

Explanation:
x = 0.5y. Therefore, y = x / 0.5 = 2x. Thus, y is 200% of x.

This question belongs to: Maths Percentage

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