2per 3 + 2 1 per 2 + 3 1 per 4

2/3 + 21/2 + 31/4
=8/12 + 126/12 + 93/12
=227/12

2/3 + 2 1/2 + 3 1/4
= 8/12 + 2 6/12 + 3 3/12
= (2 + 3) + (8/12 + 6/12 + 3/12)
= 5 + 17/12
= 5 + 1 5/12
= 6 5/12