There are 303 + 453 = <<303+453=756>>756 balloons in the bag.

Once Andrew gives half of his balloons to his brother he has 756/2=<<756/2=378>>378 balloons left.

# Answer

378
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Andrew bought a big bag of balloons. The bag had 303 blue balloons and 453 purple balloons. If Andrew shares half of his balloons with his brother, how many balloons does he have left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
378
Andrew bought a big bag of balloons. The bag had 303 blue balloons and 453 purple balloons. If Andrew shares half of his balloons with his brother, how many balloons does he have left?
train