Marty ate 1/4 of his pizza and Luis ate 1/3 of his pizz. marty ate more pizza than luis. how is that possible?

Marty's pizza was bigger than Luis' to start off with.

Let's say Marty had an 24 inch pizza and Luis had a 12 inch pizza.

1/4 of 24 is 6, therefore Marty ate 6 pieces.

1/3 of 12 is 4, therefore Luis ate only 4 pieces.

Therefore, even though Marty ate a lesser proportion of his pizza, he still ate more than Luis.