John buys 2 packs of index cards for all his students.  He has 6 classes and 30 students in each class.  How many packs did he buy? Let's think step by step and output the final answer after "####".
user
John has 6*30=<<6*30=180>>180 students
So he bought 180*2=<<180*2=360>>360 packs
#### 360
John buys 2 packs of index cards for all his students.  He has 6 classes and 30 students in each class.  How many packs did he buy?
train