At a party, there are 400 students, a combination of poets, singers and tree huggers. There are 50 more poets than treehuggers at the party. If the number of tree huggers is 120, how many singers are at the party?
Since there are 50 more poets than treehuggers at the party, the number of poets is 120+50 =170
The number of poets and tree huggers at the party is 170+120 = <<170+120=290>>290.
Since the number of attendees at the party also included singers, there are 400-290 = <<400-290=110>>110 singers.
#### 110