When 3888 is divided by the square of a number and the answer so obtained in multiplied by 21, the final answer obtained is 252. What is the number?
Solution
Correct Answer: Option E
Let the no. be x
According to question
\(\begin{array}{l} \Rightarrow \frac{{3888}}{{{x^2}}} \times 21 = 252\\ \Rightarrow \frac{{3888}}{{252}} \times 21 = {x^2}\\ \Rightarrow \frac{{81648}}{{252}} = {x^2} \end{array}\)
= x2 = 324
Square rooting both sides
We get, x = 18
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