A number is decreased by 10% and then increased by 20%. The net change is: MCQ with Answer and Explanation

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A number is decreased by 10% and then increased by 20%. The net change is:

A. 8% increase

B. 10% increase

C. 12% increase

D. 6% increase

Answer: Option A

Solution (By JKSSB Mock Tests)

0.9 × 1.2 = 1.08, 8% increase.

This question belongs to: Maths Percentage

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Question #1

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A person travels for 4 hours at 60 kmph and then for 6 hours at 50 kmph. What is his average speed?

A. 52 kmph

B. 55 kmph

C. 53 kmph

D. 54 kmph

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Correct Answer: Option D

Explanation:
Total distance = 4×60 + 6×50 = 240+300=540 km. Total time = 10 h. Avg speed = 540/10 = 54 kmph.

This question belongs to: Maths Percentage

Question #2

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Rice price reduced by 10%, a man buys 4 kg more for Rs. 144. Reduced price per kg is:

A. Rs. 3.6

B. Rs. 3.4

C. Rs. 3.8

D. Rs. 3.2

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Correct Answer: Option A

Explanation:
Original x, xy=144. 0.9x(y+4)=144 → 129.6+3.6x=144 → x=4, reduced = 3.6.

This question belongs to: Maths Percentage

Question #3

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In an examination, 60% passed in English, 50% passed in Maths, and 20% failed in both. If 360 students passed in both, find the total number of students.

A. 1000

B. 1200

C. 800

D. 900

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Correct Answer: Option B

Explanation:
Failed Eng=40%, Maths=50%. Passed both = 100 - (40+50-20) = 30%. 30% = 360 → total = 1200.

This question belongs to: Maths Percentage

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