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.

Jonah added 0.3 cup of yellow raisins and 0.4 cup of black raisins to abatch of trail mix. How many cups of raisins did Jonah add in all?
0.7

Sally had 27 Pokemon cards. Dan gave her 41 new Pokemon cards.Sally bought 20 Pokemon cards. How many Pokemon cards does Sallyhave now?
88.0

Alyssa has 37 blue balloons, Sandy has 28 blue balloons, and Sallyhas 39 blue balloons. How many blue balloons do they have in all?
104.0