instruction:
You are given a math word problem and you are supposed to apply an addition mathematical operator on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
question:
Context: Mary is baking a cake. The recipe calls for 6 cups of flour and 13 cups of sugar. She already put in some cups of flour. If she still needs 8 more cups of flour than sugar 

 Question: How many more cups of flour does she need to add?
answer:
21


question:
Context: Randy has some blocks. He uses 52 blocks to build a tower. If there are 38 blocks left 

 Question: How many blocks did he have at the start?
answer:
90


question:
Context: Edward spent $ 16 to buy 92 books each book costing him the same amount of money. Now he has $ 6. 

 Question: How much did Edward have before he spent his money?
answer:

22