15 and 20 would both go into 60. Or 300. And several others.
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5
3 x 5 = 15
4 x 5 = 20
They both go into multiples of 60 such as 480.
300 ÷ 20 = 15
It is 20. 300/15=20.
312÷15 = 20 remainder 12
The first number they both go into is 60. (Lowest Common Multiple = 60 = 12 X 5 & 15 X 4).