Mark has 12 candy bars in total between Mars bars, Snickers, and Butterfingers.  He has 3 Snickers and 2 Mars bars.  How many Butterfingers does he have?
Not counting Butterfingers Mark has 3+2=<<3+2=5>>5 candy bars.
So Mark has 12-5=<<12-5=7>>7 Butterfingers
#### 7