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.

Joan decided to sell all of her old books. She gathered up 33 books tosell. She sold 26 books in a yard sale. How many books does Joannow have?
7.0

While taking inventory at her pastry shop, Kelly realizes that she had 0.4 box of baking powder yesterday, but the supply is now down to 0.3 box. How much more baking powder did Kelly have yesterday?
0.1

Tim's cat had kittens. He gave 3 to Jessica and 6 to Sara. He now has9 kittens. How many kittens did he have to start with?

18.0