If 40% of a number is 80, the number is: MCQ with Answer and Explanation

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If 40% of a number is 80, the number is:

A. 200

B. 150

C. 100

D. 250

Answer: Option A

Solution (By JKSSB Mock Tests)

0.4x = 80 → x = 200.

This question belongs to: Maths Percentage

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Question #1

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Price of TV increased 30% then decreased 30%. Net change:

A. 6% decrease

B. No change

C. 9% increase

D. 9% decrease

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Correct Answer: Option D

Explanation:
1.3 × 0.7 = 0.91, 9% decrease.

This question belongs to: Maths Percentage

Question #2

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5/8 expressed as percent is:

A. 65%

B. 60%

C. 62.5%

D. 67.5%

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Correct Answer: Option C

Explanation:
(5/8)×100 = 62.5%.

This question belongs to: Maths Percentage

Question #3

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In a bag, 60% are red balls, 30% are blue balls, and the rest are green balls. If 5% of red, 10% of blue, and 20% of green balls are defective, what percent of the total balls are defective?

A. 8%

B. 8.5%

C. 7.5%

D. 7%

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Correct Answer: Option A

Explanation:
Red=60, Blue=30, Green=10. Defective: Red 0.05×60=3, Blue 0.1×30=3, Green 0.2×10=2. Total defective=8%. So answer 8%.

This question belongs to: Maths Percentage

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