11 and 15 both go into 165. 165 is the LCM (Least Common Multiple) of 11 and 15.
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15 and 5 both go into every multiple of 15 .
Both 15 and 20 can go into 60, as they are both factors of that number.
They both go into 90.
15
As 11 is prime, only 1 will go into both.