In a building, there are a hundred ladies on the first-floor studying. There are three times that many girls at a party being held on the second floor of the building. How many ladies are on the two floors in total?
If there are a hundred ladies in the living room and three times that many girls at the party, there are 3*100=<<3*100=300>>300 girls at the party.
In the building there are 100+300=<<100+300=400>>400 ladies.
#### 400