`3/5 + 1/5 = (3 + 1)/5 = 4/5`
`2/5 + 5/9 = 18/45 + 25/45 = 43/45`
`9/16 + 7/16 = (9 + 7)/16 = 16/16 = 1`
`2/3 + 4/5 = 10/15 + 12/15 = 22/15`
`3/5 + 7/8 = 24/40 + 35/40 = 59/40`
`2/3 + 7/12 = 8/12 + 7/12 = 15/12`
`25/48 + 11/24 = 25/48 + 22/48 = 47/48`