40
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.
Any multiple of 280.
140, 280, 420 and so on.
To find what number multiplied by 7 gives 280, you divide 280 by 7. This calculation results in 40. Therefore, 40 is the number that, when multiplied by 7, equals 280.
7 * 40 = 280
All multiples of 840 are common multiples of 60 and 280
140, 280, 420
28, 280, 2800, 28000, 280000
140, 280, 420