There are a lot of fraction that can be equal to the values given above. It can be as follows:
1/5 = 2/10, 3/15, 4/20, 5/25, 6/30, 7/35, 8/40
4/7 = 8/14, 12/21, 16/28
6/30 = 12/60, 18/90, 24/120
5/15 = 1/3 , 10/30, 20/60
Hope this helps. Have a nice day.