human
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?
assistant
How many students does John have? ** John has 6*30=<<6*30=180>>180 students
How many packs did John buy? ** So he bought 180*2=<<180*2=360>>360 packs
#### 360