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]: While shopping , Maria bought 35 green towels and 21 white towels . If she gave her mother 34 of them , how many towels did Maria end up with ?
[EX A]: 22

[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]: Sara had 100 pennies and 783 quarters in her bank . Her dad borrowed 271 quarters from Sara . How many quarters does she have now ?
[EX A]:
512