Tom decides to make lasagna with all his beef.  It takes twice as many noodles as beef.  He has 10 pounds of beef.  He already has 4 pounds of lasagna noodles and the noodles come in 2-pound packages.  How many packages does he need to buy?
He needs 10*2=<<10*2=20>>20 pounds of noodles
That means he needs to buy 20-4=<<20-4=16>>16 pounds of noodles
So he needs to buy 16/2=<<16/2=8>>8 packages
#### 8