Paul got a box of 25 crayons and 50 erasers for his birthday. At the end of the school year he only had 6 left while not having lost a single erasers. How many crayons had been lost or given away?
1. Paul got a box of 25 crayons and 50 erasers for his birthday. 
2. At the end of the school year he only had 6 crayons left. 
3. He did not lose any erasers. 

That means that he gave away or lost 19 crayons.