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.

[EX 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?
[EX A]: 5

[EX Q]: Context: There were 21 roses in the vase. Jessica threw away 34 roses from the vase and cut some more new roses from her flower garden to put in the vase. There are now 15 roses in the vase.

Question: How many more roses did she throw away than those she cut from her garden?
[EX A]: 6

[EX Q]: Context: 2 children were riding on the bus. At the bus stop some more children got on the bus. Then there were 10 children altogether on the bus.

Question: How many more children are on the bus now than there were before the bus stop?
[EX A]:
8