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.

Melanie has 41 books and 31 magazines in her library. She boughtseveral books at a yard sale over the weekend. She now has 87 booksin her library. How many books did she buy at the yard sale?
46.0

There are 34 dogwood trees currently in the park. Park workers willplant 49 dogwood trees today. How many dogwood trees will thepark have when the workers are finished?
83.0

Dina made cookies. She used 0.625 cup of flour and 0.25 cup of sugar. How much more flour than sugar did Dina use?

0.375