A company hires employees on a contract basis, depending on the availability of work. In a particular month, they hired 200 more employees on the first week than on the second week, and 150 fewer employees on the second week than on the third week. If the number of employees hired on the fourth week was twice the number hired in the third week,  and the number of employees on the fourth week was 400, what's the average number of employees hired per week?
The fourth week had twice the number of employees as the third week, so 400/2 = <<400/2=200>>200 employees on the third week.
In the third week, they hired 150 fewer employees than on the second week, that is 200-150 = <<200-150=50>>50 employees hired on the second week.
The first week had 200 more hirings than the second week, that is 50+200 = <<50+200=250>>250 employees.
The total number of employees hired is 250+50+200+400 = <<250+50+200+400=900>>900.
The average number of employees hired per week is 900/4 = <<900/4=225>>225 employees.
#### 225