45% of a number is 135. The number is: MCQ with Answer and Explanation

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45% of a number is 135. The number is:

A. 250

B. 280

C. 320

D. 300

Answer: Option D

Solution (By JKSSB Mock Tests)

0.45x = 135 → x = 300.

This question belongs to: Maths Percentage

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Question #1

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If a number increased by 25% is 150, what is the original number?

A. 120

B. 110

C. 130

D. 100

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Correct Answer: Option A

Explanation:
Let the number be x. x * 1.25 = 150. x = 150 / 1.25 = 120.

This question belongs to: Maths Percentage

Question #2

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To pass need 45%. A student gets 54 marks and fails by 36. Max marks:

A. 250

B. 200

C. 180

D. 220

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Correct Answer: Option B

Explanation:
Pass = 90, 45% M = 90 → M = 200.

This question belongs to: Maths Percentage

Question #3

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A student multiplied a number by 3/4 instead of 4/3. What is the percentage error?

A. 40%

B. 43.75%

C. 45%

D. 50%

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Correct Answer: Option B

Explanation:
True = 4/3x. False = 3/4x. Error = (4/3 - 3/4)x = (7/12)x. % Error = ((7/12) / (4/3)) * 100 = (21/48) * 100 = 43.75%.

This question belongs to: Maths Percentage

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