If 20% of a number added to 40 gives the number. The number is: MCQ with Answer and Explanation

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If 20% of a number added to 40 gives the number. The number is:

A. 45

B. 40

C. 55

D. 50

Answer: Option D

Solution (By JKSSB Mock Tests)

0.2x + 40 = x → 0.8x = 40 → x = 50.

This question belongs to: Maths Percentage

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Question #1

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A man gave 35% of money to wife, 40% of remainder to son, rest to daughter. Daughter got Rs. 3900. Total money:

A. 12000

B. 9000

C. 10000

D. 8000

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Correct Answer: Option C

Explanation:
Wife 35%, left 65%, son 40% of 65% = 26%, left 39% = 3900 → total = 10000.

This question belongs to: Maths Percentage

Question #2

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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?

A. 36%

B. 60%

C. 40%

D. 64%

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Correct Answer: Option D

Explanation:
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.

This question belongs to: Maths Percentage

Question #3

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Population of a city is 1,20,000, increasing at 10% per year. After 1 year, population is:

A. 1,35,000

B. 1,30,000

C. 1,28,000

D. 1,32,000

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Correct Answer: Option D

Explanation:
1,20,000 × 1.1 = 1,32,000.

This question belongs to: Maths Percentage

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