A number is increased by 25% and then the result is decreased by 25%. If the final number is 75, find the original number. MCQ with Answer and Explanation

Question

A number is increased by 25% and then the result is decreased by 25%. If the final number is 75, find the original number.

A. 70

B. 80

C. 85

D. 75

Answer: Option B

Solution (By JKSSB Mock Tests)

1.25 × 0.75 = 0.9375, 0.9375x = 75 → x = 80.

This question belongs to: Maths Percentage

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Question #1

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A boy scored 75% marks out of 600. How many marks did he get?

A. 425

B. 450

C. 500

D. 475

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Correct Answer: Option B

Explanation:
75% of 600 = 450.

This question belongs to: Maths Percentage

Question #2

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15% of a number is 45. 50% of that number is:

A. 150

B. 130

C. 140

D. 120

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Correct Answer: Option A

Explanation:
Number = 45/0.15 = 300; 50% of 300 = 150.

This question belongs to: Maths Percentage

Question #3

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Original salary 20000, increased 10% then decreased 10%. Final salary:

A. 20200

B. 19600

C. 19800

D. 20000

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Correct Answer: Option C

Explanation:
20000×1.1×0.9 = 19800.

This question belongs to: Maths Percentage

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