140, 280, 420, 560, 700, 840
5 + 10+15+20=50 ans
The first 6 multiples of 7 are: 7, 14, 21, 28, 35, and 42.
The first four multiples of five: 5, 10, 15, 20
6, 12, 18. 7, 14, 21.
Since the lowest common multiple of 6 and 7 is 42, the multiples of 6 and 7 are multiples of 42. The first five are: 42 84 126 168 210
The number of integers that are multiples of both 20 and 7 is infinite. Here are the first few: 140, 280, 420, 560, 700, 840 . . .
the first three common multiples of 7, 20, and 35 are 140, 280, and 420
140, 280, 420 and so on.
The First common multiple of 6 and 7 is 42 and the next common multiple is 84.
7, 14, 21, 28, 35, 42
7, 14, 21, 28, 35, 42
140,280,420