30% of 150 + 20% of 50 = ? MCQ with Answer and Explanation

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30% of 150 + 20% of 50 = ?

A. 60

B. 70

C. 65

D. 55

Answer: Option D

Solution (By JKSSB Mock Tests)

30% of 150 = 45, 20% of 50 = 10, sum = 55.

This question belongs to: Maths Percentage

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Question #1

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A number divided by 4, quotient increased by 25% then decreased by 20% gives 150. Number:

A. 560

B. 540

C. 640

D. 600

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Correct Answer: Option D

Explanation:
(N/4)×1.25×0.8 = (N/4)×1 = 150 → N/4=150 → N=600.

This question belongs to: Maths Percentage

Question #2

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

A. 40 L

B. 33.75 L

C. 36 L

D. 37.5 L

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Correct Answer: Option D

Explanation:
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

Question #3

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In an election, 80% cast votes. Winner got 55% of cast votes, won by 800. Total voters:

A. 12000

B. 15000

C. 10000

D. 8000

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Correct Answer: Option C

Explanation:
Cast votes C, winner 0.55C, loser 0.45C, margin 0.1C=800 → C=8000. Total T, 0.8T=8000 → T=10000.

This question belongs to: Maths Percentage

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