You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators 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: Greg and Sharon own neighboring cornfields . Greg harvested 0.4 acre of corn on Monday and Sharon harvested 0.1 acre . How many more acres did Greg harvest than Sharon ?

Answer: 0.3

Question: Vanessa had 13 music files and 30 video files on her flash drive . If she deleted 10 of the files , how many files were still on her flash drive ?

Answer: 33

Question: There are 2 rose bushes currently in the park . Park workers will plant 4 more rose bushes today . How many rose bushes will the park have when the workers are finished ?

Answer:
6