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

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

A. 250

B. 350

C. 300

D. 200

Answer: Option C

Solution (By JKSSB Mock Tests)

0.3x - 0.25x = 0.05x = 15 → x = 300.

This question belongs to: Maths Percentage

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Question #1

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If 30% of the first number plus 40% of the second number equals 60, and 40% of the first plus 30% of the second equals 66, find the first number.

A. 120

B. 140

C. 100

D. 150

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Correct Answer: Option A

Explanation:
0.3x+0.4y=60 → 3x+4y=600; 0.4x+0.3y=66 → 4x+3y=660. Solve: x=120.

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Question #2

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The population of a town increases by 10% annually. If the current population is 12,100, what was the population two years ago?

A. 9,000

B. 10,000

C. 11,000

D. 12,000

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Correct Answer: Option B

Explanation:
Let the population two years ago be P. P * (110 / 100) * (110 / 100) = 12100. P * 1.21 = 12100 implies P = 10000.

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Question #3

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35 is what percent of 140?

A. 20%

B. 22.5%

C. 25%

D. 30%

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Correct Answer: Option C

Explanation:
(35/140)×100 = 25%.

This question belongs to: Maths Percentage

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