Answer and Explanation
Your Answer is
Correct Answer is B
Explanation
Because c is 3 times of a, and a and b are prime numbers greater than 3, the least common multiple of abc is 3ab, that is, abc/a. So choose B
57. Consider the fractions 
, 
, and 
, where 
and 
, are distinct prime numbers greater than 3 and 
. Suppose that 
is used as the common denominator when finding the sum of these fractions. In order for the sum to be in lowest terms, its numerator and denominator must be reduced by a factor of which of the following?