All common multiples of 7, 10 and 8 are divisible by them. The lowest common multiple of them is 280, so all multiples of 280 are divisible by them, namely 280, 560, 840, 1120, ...
40x=280 x=7
the first three common multiples of 7, 20, and 35 are 140, 280, and 420
140, 280, 420 and so on.
140, 280, 420 and so on.
Any multiple of 280.
7 * 40 = 280
All multiples of 840 are common multiples of 60 and 280
28, 280, 2800, 28000, 280000
140, 280, 420 and so on.
They are: 140, 280 and 420
140, 280, 420