NIFT UG 2020 Question Paper with solutions

Question : 15 of 150

Marks: +1, -0

While solving a problem, by mistake, Anita squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the right answer. What was the given number?

13
38
48
Cannot be determined

Validate

Solution:

Let the given number be

x

.
According to the question,

(x-25)^{2}=x^{2}-25

⇒ \;\; x^{2}+625-50 x=x^{2}-25

⇒ \;\; 50 x=650

⇒ \;\; x=\;{650}/{50}=13

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