A sum of money at simple interest amounts to Rs. 920 in 3 years and to Rs. 1040 in 5 years. Find the principal. MCQ with Answer and Explanation

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A sum of money at simple interest amounts to Rs. 920 in 3 years and to Rs. 1040 in 5 years. Find the principal.

A. Rs. 760

B. Rs. 740

C. Rs. 700

D. Rs. 720

Answer: Option B

Solution (By JKSSB Mock Tests)

SI for 2 years = 1040-920 = 120, SI per year = 60. For 3 years, SI = 180, principal = 920-180 = 740.

This question belongs to: Maths Percentage

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Question #1

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In an election, 20% of the votes were invalid. A got 55% of valid votes and won by 2000 votes. Total votes polled:

A. 24000

B. 22000

C. 28000

D. 25000

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Correct Answer: Option D

Explanation:
Valid votes V, margin 0.1V=2000 → V=20000. Total T, 0.8T=20000 → T=25000.

This question belongs to: Maths Percentage

Question #2

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60 L mixture, milk:water 2:1. To make 1:2, water added:

A. 60 L

B. 50 L

C. 55 L

D. 65 L

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Correct Answer: Option A

Explanation:
Milk=40 L, water=20 L. For 1:2, water=80 L, add 60 L.

This question belongs to: Maths Percentage

Question #3

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A number is erroneously multiplied by 5/3 instead of 3/5. Percentage error in calculation:

A. 180%

B. 177.78%

C. 166.67%

D. 150%

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Correct Answer: Option B

Explanation:
Correct = (3/5)x, wrong = (5/3)x. % error = [(5/3 - 3/5)/(3/5)]×100 = (16/9)×100 ≈ 177.78%.

This question belongs to: Maths Percentage

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