15 and 5 both go into every multiple of 15 .
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5
The lowest number that both 15 and 25 go into is 75. 15 goes into 75 5 times, and 25 goes into 75 three times.
Both 15 and 20 can go into 60, as they are both factors of that number.
They both go into 90.
It is: 15 because 1*15 = 15 and 3*5 = 15