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.

Context: Julia played tag with 15 kids on monday, 18 kids on tuesday and 7 kids on wednesday. 

 Question: How many more kids did she play with on monday and tuesday than on wednesday?
26

Context: Dan has $ 4. He bought 99 candy bar for $ 3 each one costing the same amount of money. 

 Question: How much money is left?
1

Context: Ed had 12 more marbles than Doug. Ed lost 20 of his marbles at the playground. If Ed had 17 marbles 

 Question: How many marbles does Doug have now?

5