If a number decreased by 20% is 64, what is the original number? MCQ with Answer and Explanation

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If a number decreased by 20% is 64, what is the original number?

A. 100

B. 70

C. 80

D. 90

Answer: Option C

Solution (By JKSSB Mock Tests)

Let the number be x. x * 0.80 = 64. x = 64 / 0.80 = 80.

This question belongs to: Maths Percentage

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Question #1

Cost article Rs. 500, marked up 60%, then 25% discount. Selling price:

A. 625

B. 575

C. 600

D. 550

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Correct Answer: Option C

Explanation:
Marked = 500×1.6 = 800, SP = 800×0.75 = 600.

This question belongs to: Maths Percentage

Question #2

Price of sugar increased 30%. Expenditure to rise only 10%. Consumption reduced by:

A. 18%

B. 16.67%

C. 15.38%

D. 14.5%

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Correct Answer: Option C

Explanation:
1.3 × x = 1.1 → x = 1.1/1.3 ≈ 0.84615, reduction 15.38%.

This question belongs to: Maths Percentage

Question #3

80 L mixture, 20% water. Water added to make 50%:

A. 44 L

B. 48 L

C. 40 L

D. 52 L

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Correct Answer: Option B

Explanation:
Milk=64 L, water=16 L. For milk 50%, total = 128 L, add 48 L water.

This question belongs to: Maths Percentage

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