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: Fred has 709 green balloons, he gave Sandy 221 of the balloons.How many green balloons does he now have?

SOLUTION: 488.0

PROBLEM: Ron weighed 2 colored metal balls during a science class. The blue ball weighed 6 pounds and the brown ball weighed 3.1 pounds. If Ron places both balls on the scale at the same time, what will thescale read?

SOLUTION: 9.1

PROBLEM: A construction company ordered 0.16 ton ofconcrete, 0.14 ton of bricks, and 0.5 ton of stone. How many tons of material did the company order in all?

SOLUTION:
0.8