,dua dua perenam bagi tiga satuper dua bagi empat persepuluh

2 2/6= 14/6
3 1/2 = 7/2
4/10 = 2/5
14/6 : 7/2 = 15/6 x 1/7 = 15/42
15/42 : 2/5 = 15/42 x 5/2 = 75/84