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: 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

PROBLEM: In Shannon's apartment complex, 0.2 of the apartments are one-bedroom apartments and 0.3 are two-bedroom apartments. What fraction of the apartments areeither 1 - or two-bedroom apartments?

SOLUTION: 0.5

PROBLEM: At the beach, Miki and her sister both built sandcastles and then measured their heights. Miki's sandcastle was 0.83 foot tall and her sister's was 0.53 foot tall. How much taller was Miki's sandcastle than her sister's?

SOLUTION:
0.3