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.

[EX Q]: Joan has 47 green and 48 red marbles . Fred took 24 of Joan 's green marbles . How many green marbles does Joan now have ?
[EX A]: 23

[EX Q]: Joan has 9 blue balloons but lost 2 of them . How many blue balloons does Joan have now ?
[EX A]: 7

[EX Q]: There are 7 dogwood trees currently in the park . Park workers will plant 5 dogwood trees today and 4 dogwood trees tomorrow . It took 8 workers to finish the work . How many dogwood trees will the park have when the workers are finished ?
[EX A]:
16