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.

[Q]: Context: The cave is 1218 feet deep and they are already at 849 feet. If they are travelling at speed of 17 

 Question: How much farther until they reach the end of the cave?
[A]: 369


[Q]: Context: Dave had 15 apps and 24 files on his phone. After deleting some apps and files he had 21 apps and 4 files left. 

 Question: How many more apps than files does he have left on the phone?
[A]: 17


[Q]: Context: Baker made 99 cakes. He bought 167 new cakes and sold 89 cakes. 

 Question: How many more cakes did baker buy than those he sold?
[A]:
78