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
15 and 20 would both go into 60. Or 300. And several others.
5
The only number that can go into both numbers is 5
15 and 25 both go into 75. It's kind of obvious once you think about it ~Peace Out
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.
10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, +5 . . .
There are 4 positive and 4 negative numbers that go into 15. They are: 1,3,5,15,-1,-3,-5, and -15.
They have a common factor of 3.1, 2, 3, and 6 go into 6.1, 3, 5, and 15 go into 15.1 and 3 both go into 6 and 15.
1 only as 3 & 5 r prime numbers.
The first number they both go into is 60. (Lowest Common Multiple = 60 = 12 X 5 & 15 X 4).
Both 15 and 20 can go into 60, as they are both factors of that number.
They both go into 90.