Brenda ordered 12 dozen cookies from Briona’s Bakery for the family reunion.

1/3
of the cookies are peanut butter cookies.

1/6
of the cookies are iced sugar cookies.

3/8
of the cookies are chocolate chip cookies.

The rest of the cookies are oatmeal cookies.

How many cookies are oatmeal cookies?

1 answer

The total number of cookies is 12 dozen x 12 cookies/dozen = <<12*12=144>>144 cookies.
The number of peanut butter cookies is 144 cookies x 1/3 = <<144*1/3=48>>48 cookies.
The number of iced sugar cookies is 144 cookies x 1/6 = <<144*1/6=24>>24 cookies.
The number of chocolate chip cookies is 144 cookies x 3/8 = <<144*3/8=54>>54 cookies.
The number of oatmeal cookies is 144 cookies - 48 cookies - 24 cookies - 54 cookies = <<144-48-24-54=18>>18 cookies. Answer: \boxed{18}.