NIACL Model Paper 7 with solutions for free online practice

Question : 58 of 100

Marks: +1, -0

When 3888 is divided by the square of a number and the answer so obtained is multiplied by 21, the final answer obtained is 252. What is the number ?

Solution:

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

3888/{x^2}×21 = 252

⇒

252× x^2 = 3888×21

⇒

x^2 ={3888×21} /252= 324

∴

x= √324 =1 8

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