Answer:
i don’t know
Explanation:
The answer is the printing press
1/7, 2/14, 3/21, 4/28, 5/35, 6/42, 7/49, 8/56, 9/63, 10/70, 11/77, 12/84, 13/91, 14/98, 15/105, 16/112, 17/119, 18/126, 19/133, 20/140 ...
