Answer: 1 2/3 cups of butter
Explanation:
3 dozen cookies are 3x12= 36 cookies
10 dozen cookies are 10x12= 120 cookies
36 cookies->1/2 cup of butter
1 cookie-> 1/2 ÷ 36
=1/72
1 cookie needs 1/72 cup of butter.
120 cookies->1/72 x 120
=1 2/3
1 2/3 cups of butter are needed