A number decreased by 15% becomes 170. Original number is: MCQ with Answer and Explanation

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A number decreased by 15% becomes 170. Original number is:

A. 195

B. 200

C. 205

D. 190

Answer: Option B

Solution (By JKSSB Mock Tests)

0.85x = 170 → x = 200.

This question belongs to: Maths Percentage

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Question #1

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Two successive discounts of 20% and 10% on Rs. 2000 give final price:

A. 1440

B. 1400

C. 1360

D. 1500

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Correct Answer: Option A

Explanation:
2000 × 0.8 × 0.9 = 1440.

This question belongs to: Maths Percentage

Question #2

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Price of a commodity falls by 15%. To keep expenditure constant, consumption must increase by:

A. 18%

B. 20%

C. 17.64%

D. 15%

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Correct Answer: Option C

Explanation:
New price 0.85, consumption multiplier needed = 1/0.85 ≈ 1.17647, increase 17.64%.

This question belongs to: Maths Percentage

Question #3

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A's salary 20% less than B's. By what % must A's salary be raised to equal B's?

A. 30%

B. 22.5%

C. 25%

D. 20%

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Correct Answer: Option C

Explanation:
A=80, B=100. Increase needed = (20/80)×100 = 25%.

This question belongs to: Maths Percentage

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