6.mrs. whitney is baking fifteen dozen cookies for a charity bake sale. her recipe requires one cup of butter for every thirty-six cookies. how many cups of butter will she use in all?

5 cups of butter.
1 cup per 36 cookies, which is 3 dozen.
She needs 15 dozen, which is 5 times 3 dozen.
So 1 cup times 5=5 cups.

15x12= 180

180/36=5
She will need 5 cups of butter

5

Step-by-step explanation:

15 x 12 =180

180 divided by 36 = 5

5 cups of butter

First we know that a dozen is 12

so She makes 12×15 cookoes which is

180 cookies

so lets put it in an equation.

36 cookies = 1 cup butter

180 cookies = X

The criss cross method

36 X = 180 cup of butter (notice here that the cookie cancelled out)

dividing each side by 36 we get

5 cups of butter

She will use five cups of butter