<human>:  In a graduation ceremony, each graduate can bring their 2 parents. Twenty teachers and half as many administrators will also attend the graduation ceremony. If there are 50 graduates, how many chairs must be prepared for the ceremony?
<bot>: How many parents are expected to attend? ** There will be 50 x 2 = <<50*2=100>>100 parents that are expected to attend.
How many administrators will attend? ** 20/2 = <<20/2=10>>10 administrators will attend.
How many chairs must be prepared? ** Hence, 50 graduates + 100 parents + 20 teachers + 10 administrators = 180 chairs must be prepared.
#### 180