You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: Bobby had 32 pieces of candy. He ate some pieces of candy. If he has 20 pieces of candy left 

 Question: How many pieces of candy did Bobby eat?
12

Context: Every day Ryan spends 2 hours on learning english, 5 hours on learning chinese and 4 hours on learning spanish. 

 Question: How many more hours does he spend on learning chinese than he does on learning spanish?
1

Context: Paul got a box of 601 crayons and 406 erasers for his birthday. At the end of the school year he only had 336 crayons left while not having lost a single eraser. 

 Question: How many more erasers than crayons did he have left?

70