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: A florist had 50 roses . If she sold 15 of them and then later picked 21 more , how many roses would she have ?

Answer: 56

Question: Frank had saved up 3 dollars . If he received another 37 dollars for his allowance , how many 8 dollar toys could he buy ?

Answer: 5

Question: Sam was collecting cans for recycling . On Saturday he filled 4 bags up and on Sunday he filled 3 more bags . If each bag had 6 cans in it , how many cans did he pick up total ?

Answer:
42