<human>:  Travis and his brother joined a trick-or-treat event. They collected 68 pieces of candy altogether. Each of them ate 4 pieces of candy after the event. How many pieces of candy were left?
<bot>: How many pieces of candy did they eat after the event? ** They ate a total of 4 x 2 = <<4*2=8>>8 pieces of candy after the event.
How many pieces of candy are left? ** So, Travis and his brother have 68 - 8 = <<68-8=60>>60 pieces of candy left.
#### 60