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: Lucy went to the grocery store. She bought 23 packs of cookie and some packs of cake. In total she had 27 packs of grocery 

 Question: How many packs of cake did she buy in all?
4

Context: For Gwen's birthday she received 5 dollars from her dad. Her mom gave her 2 more dollars. If she spent 6 dollars. 

 Question: How much more money did she receive from her dad than she did from her mom?
3

Context: At the zoo, a cage had snakes and alligators. The total number of animals in the cage was 79. If 24 snakes and 51 alligators were hiding 

 Question: How many animals were not hiding in all?

4