4 1/3 = (4*3 + 1)/3 = 13/3
3 4/7 = (3*7 + 4)/7 = 23/7
1 7/8 = (1*8 + 7)/8 = 15/8
2 12/15 = (2*15 + 12)/15 = 42/15 = 14/5
4 1/3 = (4*3 + 1)/3 = 13/3
3 4/7 = (3*7 + 4)/7 = 23/7
1 7/8 = (1*8 + 7)/8 = 15/8
2 12/15 = (2*15 + 12)/15 = 42/15 = 14/5