I cant solve this word problem to save my life, can anyone solve it?

Question

A boxer is put on a diet to gain 14 lb in four weeks. The gains 4 1/3 lb the first week and 5 5/6 lb the second week. How much weight must the boxer gain during the third and fourth weeks in order to gain a total of 14 lb?

Answer 1

Well so far he gained 4 and 1/3 + 5 and 5/6

                             =4 and 2/6 + 5 and 5/6

                             = 26/6 + 35/6

                             = 61/6

                             = 10 and 1/6

 

14 - 10 and 1/6 =

 

13 and 6/6 - 10 and 1/6 =

 

3 and 5/6 left to go