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carcass
When n is divided by 9, the result is an integer, and when 441 is divided by n, the result is an integer. If 9 < n < 441, what is the value of n?

(A) 147
(B) 121
(C) 63
(D) 49
(E) 27


\(9 = 3^2\) & \(441 = 21^2 = 3^2 7^2\)

\(\frac{n}{3^2}\) is an integer => n has at least two 3's in it for this condition to satisfy
\(\frac{441}{n^2}\) is an integer => There is at least one 3 and one 7 in n

Taking both of the above into consideration, we can safely say that

n has at least two 3's and one 7 in it => n is a multiple of 63

The only number from the options is the number 63 only

Answer - C
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