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: There were 13 roses in the vase. Jessica cut some more roses from her flower garden which had a total of 12 roses. There are now 21 roses in the vase.

Question: How many roses are left in the garden?

Answer: 4

Question: Context: Danny collects bottle caps and wrappers. He found 11 bottle caps and 28 wrappers at the park. Now he has 68 bottle caps and 51 wrappers in his collection.

Question: How many more wrappers than bottle caps did danny find at the park?

Answer: 17

Question: 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?

Answer:
23