NIACL Model Paper 9 with solutions for free online practice

Question : 46 of 100

Marks: +1, -0

(78)^2

is subtracted from the square of the number, the answer so obtained is 6,460. What is the number?

Solution:

(5) Let the number be x.
According to the question,

x^2 - 78^2 = 6460

⇒

x^2 = 6460 + 6084 ⇒ x^2 = 12544

⇒

x=√12544 =112

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