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

Akhilesh ? Apr 1 '25 at 20:38

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 \( 31 \times \frac{3}{2} \neq 72 \).

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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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