If 25% of a number is subtracted from 30% of the same number, the result is 15. Find the number. MCQ with Answer and Explanation

If 25% of a number is subtracted from 30% of the same number, the result is 15. Find the number.

A. 350

B. 250

C. 300

D. 200

Answer: Option C

0.3x - 0.25x = 0.05x = 15 → x = 300.

This question belongs to: Maths Percentage

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Question #1 Report Error

Population 2,00,000. First year +8%, second year -5%. Population after 2 years:

A. 2,05,200

B. 2,08,800

C. 2,07,600

D. 2,06,400

Correct Answer: Option A

Explanation:
2,00,000 × 1.08 × 0.95 = 2,05,200.

This question belongs to: Maths Percentage

Question #2 Report Error

If 50% of a number is added to another, second becomes 140% of itself. Ratio of first to second:

A. 5:4

B. 2:5

C. 4:5

D. 3:5

Correct Answer: Option C

Explanation:
0.5F + S = 1.4S → 0.5F = 0.4S → F/S = 0.4/0.5 = 4/5.

This question belongs to: Maths Percentage

Question #3 Report Error

If the length of a rectangle is increased by 25%, by what percentage must the width be decreased to keep the area unchanged?

A. 20%

B. 15%

C. 25%

D. 33.33%

Correct Answer: Option A

Explanation:
Required decrease = (25 / 125) * 100 = 20%.

This question belongs to: Maths Percentage