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]: Mary has 9 yellow marbles Joan has 3 yellow marbles . How many yellow marbles do they have in all ?
[EX A]: 12

[EX Q]: Ned was helping the cafeteria workers pick up lunch trays , but he could only carry 5 trays at a time . If he had to pick up 5 trays from one table and 5 trays from another , how many trips will he make ?
[EX A]: 2

[EX Q]: Rosa had 67 flowers . Andre gave her some more flowers . Now , Rosa has 90 flowers . How many flowers did Andre give to Rosa ?
[EX A]:
23