Marty ate 4/6 of his pizza and luis ate 5/6 of his pizza. marty ate more of his pizza. how is this possible

Marty ate 4/6 of his own pizza.  He has (1 - 4/6) left.  = 2/6

Luis ate 5/6 of his own pizza.

Marty ate more of his own pizza because he has 2/6 left.

This is possible because each person ate of the fraction of his own.