A number decreased by 20% becomes 64. The number is: MCQ with Answer and Explanation

A number decreased by 20% becomes 64. The number is:

A. 76

B. 84

C. 72

D. 80

Answer: Option D

0.8x = 64 → x = 80.

This question belongs to: Maths Percentage

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Question #1 Report Error

One student scores 35% fails by 15, another 45% gets 25 more than pass. Pass marks:

A. 145

B. 150

C. 155

D. 160

Correct Answer: Option C

Explanation:
0.35M+15=0.45M-25 → 0.1M=40 → M=400, pass=0.35×400+15=155.

This question belongs to: Maths Percentage

Question #2 Report Error

Machine depreciates 10% per year. Present value Rs. 81,000, value 2 years ago was:

A. 90,000

B. 1,00,000

C. 1,20,000

D. 1,10,000

Correct Answer: Option B

Explanation:
Value 2 years ago = 81000 / (0.9×0.9) = 1,00,000.

This question belongs to: Maths Percentage

Question #3 Report Error

Employees reduced by 20%. To keep total wage bill same, wage per head must increase by:

A. 20%

B. 22.5%

C. 25%

D. 30%

Correct Answer: Option C

Explanation:
New employees 0.8, wage per head multiplier = 1/0.8 = 1.25, increase 25%.

This question belongs to: Maths Percentage