WBBSEClass XMathematicsRatio And Proportion01 Mark2025 Moderate

QQuestion

If a:2 = b:5 then how many % of b is a

(a) 20

(b) 30

(c) 40

(d) 50

Exam-ready answer • 01 Mark

Answer

(c) 40

Explanation:

⇒ a / 2 = b / 5

⇒ a × 5 = b × 2

⇒ a = (2/5) b

Now, percentage of b that a represents:

(a / b) × 100 = (2/5) × 100 = 40%

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