You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

[EX Q]: Melanie had 30 baseball cards, and 9 were torn. Sara bought 18 ofMelanie's baseball cards. How many baseball cards does Melaniehave now?
[EX A]: 12.0

[EX Q]: Jason grew 23 watermelons and 18 turnips. Nancy grew 28watermelons. How many watermelons did they grow in total?
[EX A]: 51.0

[EX Q]: Dan had 97 baseball cards, and 8 were torn. Sam bought 15 of Dan'sbaseball cards. How many baseball cards does Dan have now?
[EX A]:
82.0