Question

2.Solve the following proportion. r/5=9/21 A. r=9 B. r=2.14 C. r=11.66 D. r=37.8

3.A recipe calls for 4 cups of sugar to make 4 dozen cookies. Use the proportion to calculate how much sugar is needed to make 8 dozen cookies.

Answer 1

2. r/5=9/21
r x 21 = 9 x 5
r= 45/21
r= 2.14 ( the answer is B)

3. 4 cups-> 4 dozen
x cups-> 8 dozen

4/x = 4/8
X x 4= 4 x 8
x= 32/4
x= 8 cups