Mark has a really bad headache.  He takes 2 Tylenol tablets of 500 mg each and he does every 4 hours for 12 hours.  How many grams of Tylenol does he end up taking?
He takes 12/4=<<12/4=3>>3 doses
Each dose is 500*2=<<500*2=1000>>1000 mg
So he takes 3*1000=<<3*1000=3000>>3000 mg
So he takes 3000/1000=<<3000/1000=3>>3 grams of Tylenol
#### 3