Every time the number is divided by 2 like 8 divided by 2 is 4 and 4 divided by 2 is 2 and so on so if you divide 1/4 by 2 it would be 0.125 and that in fraction would be 1/8.
To work this out all you need to do is 108 divide by 7. The answer would be 15.43 Therefore he would eat 15.43 pounds or you could round it down to 15 pounds.