180, 360, 540, 720, 900 +180 . . .
60, 120, and all multiples of 60 thereafter.
The smallest number that 8 or 12 or 20 will all go in to is 120 120 = 20 x 6 = 12 x 10 = 8 x 15 as there is then no number that goes into 6 and 10 and 15 equally.
9 has no common factors with 20- sorry!
The LCM of the given three numbers is 60
429,294
they all go into 24
All multiples of 42.
42
14
Let number be x Then x - (-14) = 20 or x + 14 = 20 or x = 20 -14 or x = 6 Verification: 6 - (-14) = 6 + 14 = 20
They are 1, 2, 7 and 14.
6