Brianna's chocolate chip cookie recipe will make about 3 dozen chocolate chip cookies the recipe calls for 2 1/4 cups of flour and 3/8 cup of baking soda and brianna wants to adjust the recipe to include 1 cup of baking soda how many cups of flour would she needs to use

Write and solve an equation of ratios to answer this.

2.25 cup              x
=
0.375 cup          1 cup
                                                                                  2.25
cross-multiplying, 2.25 = 0.375x.  Solving for x, x = = 6
                                                                                   0.375

Brianna would need to use 6 cups of flour if she wants the mixture to contain 1 cup of baking soda.