Jared's friends can eat a total of 60 x 3 = <<60*3=180>>180 pieces of popcorn.
Jared and his three friends can eat a total of 180 + 90 = <<180+90=270>>270 pieces of popcorn.
Therefore, Jared should order 270/30 = <<270/30=9>>9 servings of popcorn.
#### 9