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SSC Selection Post 2022 PYQ — Question 74

SSC Selection Post - Matriculation Level - 1 Aug 2022 - Shift 1 • Quantitative Aptitude • Q74

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15 is the mean proportional of 30 and a. Find the value of a.

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 15215\over 2.

Mean proportional = 30×a\sqrt{30\times a}

⇒ 15 = 30×a\sqrt{30\times a}

⇒ 225 = 30a

⇒ a = 15215\over 2