Question

A recipe for twelve cupcakes uses two cups of flour. Angela wants to bake forty cupcakes for the bake sale. Which proportion below should she use to find the amount of flour needed?

Answer 1

Answer: 12:2=40:x

6.66 cups of flour

Explanation:

12 cupcakes------2 cups flour

40 cupcakes-----X cups of flour

use proportion :

12:2=40:x

12x=80

X=6.66 cups

Answer 2

She should use:

1 : 6 as the proportion of cups of flour to number of cupcakes

6.6 cups of flour to bake 40 cupcakes

Explanation:

2 cups of flour = 12 cupcake

Proportion of cups of flour to number cupcake is

= 2 : 12 which is equivalent to 1 : 6 in it simplest form

Proportion of cups of flour to number cupcake = 1 : 6

Therefore

Number of cupcakes : cups of flour

= 6 : 1

To bake forty cupcakes

let y represent cups of flour.

6 : 1 = 40 : y

6/1 = 40/y

6y = 40

y = 40/6

y = 6.6 cups of flours

Therefore she should use Proportion of number cupcake to cups of flour = 1 : 6