NIACL Model Paper 4 with solutions for free online practice

Question : 18 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 so obtained is 252. What is the number?

324
16
256
144
None of these

Validate

Solution:

(e) Let the number = x.
ATQ,

3888/{x^2}×21=252

⇒

x^2=3888/252×21=324

∴

x=√324 = 18

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