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, let's determine how many crayons Paul started with. We know that he ended with 523 crayons, and we know that he lost no erasers, so we can set up the equation: 

 457 + x = 523

x = 523 - 457

x = 66

So Paul started with 457 erasers and 66 crayons. 

Now we need to determine how many crayons he had at the beginning of the school year. We know that he ended with 523 crayons and we know that he started with 66 crayons, so we can set up the equation: 

66 + x = 523

x = 523 - 66

x = 457

So Paul started with 457 crayons at the beginning of the school year. 

Now we need to determine how many erasers he had at the beginning of the school year. We know that he ended with 457 erasers and we know that he started with 457 erasers, so we can set up the equation: 

457 + x = 457

457 + 0 = 457

Therefore, Paul had 0 erasers at the beginning of the