B.Ed (CHANDIGARH) 2018 Entrance Exam With Answers

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83.

If 20% of a = b, then b% of 20 is the same as :

A: 80% of a
B: 4% of a
C: 20% of a
D: 5% of a

The answer is: B

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Explanation

20 % of a = b

⇒ a × (20/100) = b

⇒ a × (1/5) = b

⇒ a : b = 5 : 1

Let a = 5 and b = 1

Let b% of 20 is the same as x% of a, then

b% of 20 = x% of a

⇒ 20 × (1/100) = 5 × (x/100)

⇒ x = 20/5

∴ x = 4%

The correct option is 4% of a.