A number is increased by 10% and then decreased by 10%. If the resulting number is 1188, what was the original number? MCQ with Answer and Explanation

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A number is increased by 10% and then decreased by 10%. If the resulting number is 1188, what was the original number?

A. 1100

B. 1150

C. 1200

D. 1250

Answer: Option C

Solution (By JKSSB Mock Tests)

1.1 × 0.9 = 0.99, 0.99x = 1188 → x = 1200.

This question belongs to: Maths Percentage

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Question #1

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A student answered 22 out of 30 correctly. Percentage correct:

A. 75%

B. 70%

C. 72%

D. 73.33%

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Correct Answer: Option D

Explanation:
(22/30)×100 ≈ 73.33%.

This question belongs to: Maths Percentage

Question #2

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Price of petrol increased by 30%. To keep expenditure same, consumption must reduce by:

A. 23.08%

B. 25%

C. 30%

D. 20%

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Correct Answer: Option A

Explanation:
Reduction % = (30/130)×100 ≈ 23.08%.

This question belongs to: Maths Percentage

Question #3

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A number is divided into two parts. 40% of the first part exceeds 30% of the second part by 20, and 50% of the second part exceeds 25% of the first part by 25. Find the number.

A. 240

B. 260

C. 200

D. 300

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Correct Answer: Option B

Explanation:
Let parts x, y. 0.4x - 0.3y = 20 → 4x - 3y = 200. 0.5y - 0.25x = 25 → 20y - 10x = 1000 → 2y - x = 100. Solve: x = 2y - 100. Substitute: 4(2y-100)-3y=200 → 8y-400-3y=200 → 5y=600 → y=120, x=140, sum=260.

This question belongs to: Maths Percentage

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