Gold = <<141=141>>141

Silver = 141 * 2 = <<141*2=282>>282

141 + 282 + 150 = <<141+282+150=573>>573

There are 573 gold, silver, and black balloons in total.

# Answer

573
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are 141 gold balloons and twice as many silver balloons. If the gold and silver balloons were added to 150 black balloons, how many balloons are there in total?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
573
There are 141 gold balloons and twice as many silver balloons. If the gold and silver balloons were added to 150 black balloons, how many balloons are there in total?
train