NCHMCT JEE 2016 Question Paper with solutions for online practice

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Question : 7 of 200

Marks: +1, -0

Three-fifth of the square of a certain number is 126.15. What is the number?

14.5
75.69
145
210.25

Solution:

Let, the number = x

3/5 (x)^2

= 126.15
⇒

3x^2

= 126.15 × 5
= 630.5
⇒

x^2

=

{630.75}/{3}

= 210.25
⇒ x =

√{210.25}

= 14.5

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