TASK DEFINITION: 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.
PROBLEM: Joan has 9 blue balloons, Sally has 5 blue balloons, and Jessica has 2blue balloons. How many blue balloons do they have in total?

SOLUTION: 16.0

PROBLEM: Benny picked 2 apples and Dan picked 9 apples from the apple tree.How many apples were picked in total?

SOLUTION: 11.0

PROBLEM: A restaurant served 4 pies during lunch and 9 during dinner today.The restaurant served 7 pies and 2 pizzas yesterday. How many pieswere served in total?

SOLUTION:
20.0