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: There were 7 roses and 12 orchids in the vase. Jessica cut some more roses and orchids from her flower garden. There are now 11 roses and 20 orchids in the vase. 

 Question: How many more orchids than roses are there in the vase now?
[A]: 9


[Q]: Context: Josh had 4 marbles in his collection. He lost 16 marbles and found 8 new ones. 

 Question: How many more marbles did he lose than those he found?
[A]: 8


[Q]: Context: A waiter had 3 customers. After some left he still had 4 customers. 

 Question: How many more customers stayed behind than those that left?
[A]:
5