M/N WILL BE AN INTEGER IF M IS DIVISIBLE BY N. FOR M TO BE DIVISIB...
22. m/n will be an integer if m is divisible by n. For m to be
divisible by n, the elements of n's prime box (i.e. the prime factors
that make up n) must also appear in m's prime box.
(1) INSUFFICIENT: If 2m is divisible by n, the elements of n's prime
box are in 2m's prime box. However, since 2m contains a 2 in its
prime box because of the coefficient 2, m alone may not have all of
the elements of n's prime box. For example, if 2m = 6 and n = 2,
2m is divisible by n but m is not.
(2) SUFFICIENT: If m is divisible by 2n, m's prime box contains a 2
and the elements of n's prime box. Therefore m must be divisible
by n.
The correct answer is B.