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.
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Question: Context: 43 children were riding on the bus. At the bus stop some children got off the bus. Then there were 21 children left on the bus. 

 Question: How many children got off the bus at the bus stop?

Answer: 22


Question: Context: Baker made 157 cakes and 169 pastries. If he sold 158 cakes and 147 pastries 

 Question: How many more cakes than pastries did baker sell?

Answer: 11


Question: Context: Mary is baking a cake. The recipe calls for 9 cups of sugar 14 cups of flour and 40 cups of salt. She already put in 4 cups of flour. 

 Question: How many more cups of flour than cups of sugar does she need to add now?

Answer:
1