There are 120 crayons in a box.  One third of the crayons are new, 20% are broken, and the rest are slightly used.  How many are slightly used?
New:120/3=<<120/3=40>>40 crayons
Broken:120(.20)=24 crayons
Slightly Used:120-40-24=<<120-40-24=56>>56 crayons
#### 56