We have to find the amount of flour needed.
The order is 168 cupcakes.
The proportion between cupcakes and flour is: 5 ounces of flour for 12 cupcakes.
Then, we can use the rule of three to find the total amount of flour needed:
We can now express it in pounds and ounces using the fact that 1 lb = 16 oz.
We start by calculating how many pounds is 70 oz and then complete the decimal part expressed in ounces:
Answer: The amount of flour needed is 4 lb and 6 oz.