A student scored 30% marks and failed by 30 marks. Another scored 42% marks and got 30 marks more than passing. Pass marks are: MCQ with Answer and Explanation

Question

A student scored 30% marks and failed by 30 marks. Another scored 42% marks and got 30 marks more than passing. Pass marks are:

A. 160

B. 150

C. 180

D. 200

Answer: Option C

Solution (By JKSSB Mock Tests)

Let max M. 0.3M + 30 = 0.42M - 30 → 0.12M = 60 → M = 500. Pass = 0.3×500 + 30 = 180.

This question belongs to: Maths Percentage

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Question #1

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In a mixture of 80 litres, the ratio of milk to water is 3:2. How much water must be added to make the ratio 1:2?

A. 80 L

B. 64 L

C. 60 L

D. 72 L

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Correct Answer: Option C

Explanation:
Milk = 48 L, water = 32 L. For milk:water = 1:2, water needed = 96 L, add 64 L? Wait, 48:96 = 1:2, so add 64 L. Option B 64 L. So answer B.

This question belongs to: Maths Percentage

Question #2

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A number is multiplied by 5/3 instead of 3/5. What is the percentage error?

A. 150%

B. 177.78%

C. 180%

D. 166.67%

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Correct Answer: Option B

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

This question belongs to: Maths Percentage

Question #3

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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. 80%

C. 72.5%

D. 66.67%

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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

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