Bunuel wrote:
If a is an integer larger than 1, and x=60a, then x must be a multiple of which of the following?
A. 8
B. 9
C. 12
D. 18
E. 120
If you don't remember the rule below, do the prime factorization of 60 to get 2*2*3*5.
For each answer choice, see if you have enough prime factors from 60 to get what you need for the answer choice to be a factor of x = 60a.
A. 8 = 2*2*2. NO. We only have two 2s. "a" could be 2. It could also be 11.
B. 9 = 3*3. NO. We only have one 3. "a" could
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