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 Input:
Dan grew 42 turnips and 38 cantelopes. Jessica grew 47 turnips. Howmany turnips did they grow in total?

Ex Output:
89.0

Ex Input:
A bucket contains 3 gallons of water. If Derek adds 6.8 gallons more,how many gallons will there be in all?

Ex Output:
9.8

Ex Input:
Tim found 37 seashells and Sally found 13 seashells on the beach.When they cleaned them, they discovered that 25 were cracked.How many seashells did they find together?

Ex Output:
50.0