First find how many onions total Trent needs to chop: 4 onions/pot * 6 pots = <<4*6=24>>24 onions
Then divide that number by three onions per 2 tears to find how many sets of two tears Trent cries: 24 onions / 3 onions = <<24/3=8>>8
Then multiply that number by the number of tears per set to find the total number of tears: 8 * 2 tears = <<8*2=16>>16 tears
#### 16