50% of 500 minus a number gives 200. The number: MCQ with Answer and Explanation

50% of 500 minus a number gives 200. The number:

A. 45

B. 50

C. 40

D. 55

Answer: Option B

250 - x = 200 → x = 50.

This question belongs to: Maths Percentage

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Question #1 Report Error

5/8 expressed as percent is:

A. 60%

B. 67.5%

C. 62.5%

D. 65%

Correct Answer: Option C

Explanation:
(5/8)×100 = 62.5%.

This question belongs to: Maths Percentage

Question #2 Report Error

If the numerator of a fraction is increased by 50% and the denominator is decreased by 25%, it becomes 5/8. Find the original fraction.

A. 7/16

B. 5/12

C. 5/16

D. 3/8

Correct Answer: Option C

Explanation:
(1.5N)/(0.75D) = 2N/D = 5/8 → N/D = 5/16.

This question belongs to: Maths Percentage

Question #3 Report Error

Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper?

A. 3:2

B. 2:1

C. 1:2

D. 1:1

Correct Answer: Option C

Explanation:
By alligation: (70-50):(50-40) = 20:10 = 2:1. The ratio of the alloys is inverse: 1:2.

This question belongs to: Maths Percentage