20% of 50 + 30% of 60 equals: MCQ with Answer and Explanation

20% of 50 + 30% of 60 equals:

A. 34

B. 30

C. 32

D. 28

Answer: Option D

20% of 50 = 10, 30% of 60 = 18, sum = 28.

This question belongs to: Maths Percentage

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Question #1 Report Error

The price of a commodity is increased by x% then decreased by x%. Net decrease is 4%. Find x.

A. 15

B. 20

C. 25

D. 10

Correct Answer: Option B

Explanation:
(1+x/100)(1-x/100) = 0.96 → 1 - x²/10000 = 0.96 → x² = 400 → x = 20.

This question belongs to: Maths Percentage

Question #2 Report Error

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

A. 70

B. 90

C. 100

D. 80

Correct Answer: Option D

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

This question belongs to: Maths Percentage

Question #3 Report Error

Price of sugar increased 25%. A person buys 4 kg less for Rs. 100. Original price per kg was:

A. Rs. 6

B. Rs. 8

C. Rs. 4

D. Rs. 5

Correct Answer: Option D

Explanation:
Original price x, xy=100. New 1.25x(y-4)=100 → 1.25×100 - 5x =100 → 125-5x=100 → x=5.

This question belongs to: Maths Percentage