One night Ms. Factor baked chocolate chip cookies. She used a 20-ounce package of cookie dough to make 3 dozen cookies. What was the average weight of each cookie.

20 / 36 = 0.556 ounces

To find the average weight of each cookie, you need to divide the total weight of the cookie dough by the number of cookies.

In this case, Ms. Factor used a 20-ounce package of cookie dough to make 3 dozen cookies. One dozen is equal to 12, so she made a total of 3 x 12 = 36 cookies.

To find the average weight of each cookie, divide the total weight of the cookie dough (20 ounces) by the number of cookies (36):

Average weight per cookie = Total weight of cookie dough / Number of cookies
= 20 ounces / 36 cookies

To simplify the calculation, you can divide both the numerator and denominator by their greatest common divisor, which in this case is 4:

Average weight per cookie = (20 ounces / 4) / (36 cookies / 4)
= 5 ounces / 9 cookies

Therefore, the average weight of each cookie is approximately 5/9 ounces.