Question

PLEASE HELP PLEASE

A recipe that makes 2 dozen cookies calls for 4 1/2 cups of flour. How much flour would be needed to make 7 dozen cookies?

A) 31 1/2 cups

B) 9 cups

C) 14 cups

D) 15 3/4 cups

Answer 1

Option D) 15 3/4 cups

Explanation:

we know that

using proportion

Let

x ----> the cups of flour needed

`4(1)/(2)=(4*2+1)/(2)=(9)/(2)\ cups\ flour`

`((9/2))/(2)=(x)/(7) \\ \\x=(9/2)*7/2\\ \\x=63/4\ cups\ flour`

convert to mixed number

`63/4\ cups=15.75=15(3)/(4)\ cups`