Answer:
Mrs. Richard will need 42 cups of flour to bake 12 cakes or a dozen cakes.
Explanation:
Number of cups of flour Mrs. Richard used to bake 2 3/4 doze cakes = 115 1/2
Number of cakes Mrs. Richard baked = 2 3/4 dozens
How many cups of flour does Mrs. Richard need to bake a dozen cakes?
Number of cakes Mrs. Richard baked = 2 3/4 dozens
Number of cakes Mrs. Richard baked = 2 3/4 * 12 (To find out the exact number)
Number of cakes Mrs. Richard baked = 11/4 * 12
Number of cakes Mrs. Richard baked = 11 * 3 = 33 (Dividing by four)
If Mrs. Richard needed 115 1/2 cups of flour for baking 33 cakes, how many cups she will need to bake 12?
Using the rule of three simple, we have this:
(115 1/2 * 12) / 33 = 1,386 / 33 = 42
Mrs. Richard will need 42 cups of flour to bake 12 cakes or a dozen cakes.