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.

[Q]: Fred has 5 baseball cards . Melanie bought 3 of Fred 's baseball cards . How many baseball cards does Fred have now ?
[A]: 2


[Q]: Olivia and her mom were picking carrots from their garden . Olivia picked 20 and her mother picked 14 . If only 19 of the carrots were good , how many bad carrots did they have ?
[A]: 15


[Q]: Lana picked 36 tulips and 37 roses to make flower bouquets . If she only used 70 of the flowers though , how many extra flowers did Lana pick ?
[A]:
3