<human>:  There were 672 balloons that were either green, blue, yellow, or red. They were divided into equal groups and then Anya took half of the yellow ones home. How many balloons did Anya take home?
<bot>: How many balloons were in each group? ** 672/4 = <<672/4=168>>168 balloons
How many balloons did Anya take home? ** 168 * (1/2) = <<168*(1/2)=84>>84 balloons
How many balloons did Anya take home? ** Anya took 84 balloons home.
#### 84