Question

Khianna wants to make a batch of her Grandma chocolate chip cookies from a friend. The recipe is shown on the recipe card below ( in the photo)
She realizes she only has 1 1/8 cup of brown sugar but plenty of all of he other ingredients. Complete the following to help him determine how she can still make cookies with the recipe
1. What fractional part of the brown sugar needed does she have

3. Fill out the new recipe with the amount of each ingredient ___ cups butter
___ cups flour ___ eggs __tsp baking soda __tsp vanilla ___ cups sugar __1 1/8
___ ounces chocolate chips

How many cookies will the scaled down recipe make? Show your work.

Answer 1

Poor Khianna.  Let's help her out.

For the original recipe she needs $1 \frac 1 2 = \frac 3 2$ cups of brown sugar but only has $1 \frac 1 8 = \frac 9 8 .$  So the fraction of the brown sugar she has is

$\dfrac{ \frac{9}{8} }{\frac 3 2} = \frac 9 8 \times \frac 2 3 = \frac 3 4$

She has to scale everything by a factor of  $\frac 3 4$

I won't multiply everything by 3/4 for you.  2 cups butter becomes 1 and a half cups butter, 1 tsp vanilla becomes 3/4 tsp, etc.