Paul got a box of 457 erasers and 617 crayons for his birthday. At the end of the school year he only had 523 crayons left while not having lost a single eraser. How many more crayons than erasers did he have left?

First, we need to subtract the number of erasers he had from the total number of crayons to find out how many crayons he had left. 

We know that he started with 94 crayons and he used 24 erasers. 

94 - 24 = 

70

So, he had 70 crayons left.