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]: Joan has 8 orange balloons but lost 2 of them. How many orangeballoons does Joan have now?
[EX A]: 6.0

[EX Q]: There are 27 pencils in the drawer. Nancy placed 45 pencils in thedrawer. How many pencils are now there in total?
[EX A]: 72.0

[EX Q]: Roadster's Paving Company used 10 tons of cement to pave Lexi'sstreet and 5.1 tons of cement to pave Tess's street. How muchcement did Roadster's Paving Company use in all?
[EX A]:
15.1