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: Mary is baking a cake. The recipe calls for 9 cups of sugar 7 cups of flour and 4 cups of salt. She already put in 2 cups of flour. 

 Question: How many more cups of flour than cups of salt does she need to add now?
[A]: 1


[Q]: Context: 41 children were riding on the bus. At the bus stop some children got off the bus. Then there were 18 children left on the bus. 

 Question: How many more children were on the bus before the bus stop than there are now?
[A]: 23


[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