Lorenzo put three full cans of thumbtacks into his pocket and went off to work at the corkboard factory. It was Lorenzo's job, as head of quality control, to test every cork board for its ability to hold thumbtacks.  He placed one thumbtack from each of the three cans of thumbtacks into every board tested.  At the end of the day, he had tested 120 boards and had 30 tacks remaining in each of the three cans.  What was the total combined number of thumbtacks from the three full cans?
How many tacks did Lorenzo test? ** At the end of the day, he had tested 120 boards, each with three tacks, for a total of 3*120=<<120*3=360>>360 tacks
How many tacks did Lorenzo have left? ** He had 30 tacks remaining in each of the three cans, for an additional 3*30=<<3*30=90>>90 thumbs tacks.
What was the total combined number of thumbtacks from the three full cans? ** Therefore, the original total combined number of thumbtacks in the three full cans of thumbtacks was 360+90=<<360+90=450>>450 thumbtacks.
#### 450