Ashley had a birthday party and invited 20 of her friends, telling them to each invite one more person to attend the party. If half the number of the invited guests each came with one more person, what's the total number of people at the party, including Ashley?
If she invited 20 friends, then the number of friends who came with one more person is 1/2*20 = <<20*1/2=10>>10.
If the 10 friends came with 10 more people, the total number of guests becomes 20+10 = 30 guests.
If you add Ashley, the total number of people in the party is 30+1 = <<30+1=31>>31 people
#### 31