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]: In fourth grade there were 4 students at the start of the year . During the year 3 students left and 42 new students came to school . How many students were in fourth grade at the end ?
[EX A]: 43

[EX Q]: Megan was selling her necklaces at a garage sale . She sold 7 bead necklaces and 3 gem stone necklaces . If each necklace cost 9 dollars , how much money did she earn ?
[EX A]: 90

[EX Q]: Roger was putting his spare change into piles . He had 3 piles of quarters and 3 piles of dimes . If each pile had 7 coins in it , how many coins did he have total ?
[EX A]:
42