2 per 8 : 3 per 5 ×4 per 7 hasilnya

2/8 : 3/5 x 4/7 = 2/8 x 5/3 x 4/7
= 10/24 x 4/7
= 10/6 x 1/7
= 10/42
= 5/21

*semoga membantu. sukses selalu ^_^