A number decreased by 10% becomes 90. The number is: MCQ with Answer and Explanation

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A number decreased by 10% becomes 90. The number is:

A. 100

B. 95

C. 105

D. 110

Answer: Option A

Solution (By JKSSB Mock Tests)

0.9x = 90 → x = 100.

This question belongs to: Maths Percentage

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Question #1

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Length +25%, breadth -20%. Change in area:

A. 5% decrease

B. 0%

C. 10% increase

D. 5% increase

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Correct Answer: Option B

Explanation:
1.25×0.8 = 1, 0% change.

This question belongs to: Maths Percentage

Question #2

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The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r.

A. 10

B. 8

C. 5

D. 12

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Correct Answer: Option A

Explanation:
1 - r²/10000 = 0.99 → r² = 100 → r = 10.

This question belongs to: Maths Percentage

Question #3

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80 L mixture, 20% water. Water added to make 50%:

A. 48 L

B. 40 L

C. 44 L

D. 52 L

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Correct Answer: Option A

Explanation:
Milk=64 L, water=16 L. For milk 50%, total = 128 L, add 48 L water.

This question belongs to: Maths Percentage

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