BTGmoderatorLU wrote:Source: Manhattan Prep
How many factors greater than 1 do 120, 210, and 270 have in common?
A. One
B. Three
C. Six
D. Seven
E. Thirty
120 =
30*4
210 =
30*7
270 =
30*9
The GCF = the value in blue = 30.
Factors of 30 greater than 1:
2, 3, 5, 6, 10, 15, 30 --> 7 factors
Thus, 120, 210, and 270 have 7 common factors greater than 1.
The correct answer is
D.
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