Select the related number from the given alternatives. 20:30::?: 72

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

Select the related number from the given alternatives. 20:30::?: 72

A48

B19

C20

D31

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correct answer is: option a (48) Explanation: The relationship between 20 and 30 can be expressed as: $20 \times \frac{3}{2} = 30$. We need to find a number that, when multiplied by $\frac{3}{2}$, equals 72. Thus, the required number is $72 \div \frac{3}{2} = 72 \times \frac{2}{3} = 48$. Option a: 48 is the correct answer because $48 \times \frac{3}{2} = 72$. Option b: 19 is incorrect as $19 \times \frac{3}{2} \neq 72$. Option c: 20 is incorrect as $20 \times \frac{3}{2} \neq 72$. Option d: 31 is incorrect as $31 \times \frac{3}{2} \neq 72$. Akhilesh ? answered Apr 1 '25 at 20:38

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