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

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

A. 100

B. 90

C. 80

D. 70

Answer: Option C

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 Report Error

A population increases by 5% yearly. Its present population is 88,200. What was it 2 years ago?

A. 80000

B. 84000

C. 82000

D. 78000

Correct Answer: Option A

Explanation:
P_past = 88200 / (1.05)^2 = 88200 / 1.1025 = 80000.

This question belongs to: Maths Percentage

Question #2 Report Error

Batsman scored 110 runs with 3 fours, 8 sixes. % runs from running:

A. 42.5%

B. 45.45%

C. 50%

D. 40%

Correct Answer: Option B

Explanation:
Boundary runs = 12+48=60, running=50. % = (50/110)×100 ≈ 45.45%.

This question belongs to: Maths Percentage

Question #3 Report Error

Sold watch at 8% loss. If sold for Rs. 104 more, gain 8%. Cost price:

A. 600

B. 675

C. 650

D. 625

Correct Answer: Option C

Explanation:
CP=x, SP=0.92x. 0.92x+104=1.08x → 0.16x=104 → x=650.

This question belongs to: Maths Percentage