Dave breaks 2 guitar strings per night when playing live.  If he performs 6 shows a week for 12 weeks, how many guitar strings will he need to replace?
He breaks 2 strings a night for 6 nights for a total of 2*6 = <<2*6=12>>12 broken strings
He breaks 12 strings per week so over 12 weeks, he will need to replace 12*12 = <<12*12=144>>144 guitar strings
#### 144