A recipe calls for 4cups of flour for 12
muffins. How many muffins can you make.
with 5 cups of flour?

15 muffins

Step-by-step explanation:

We can use proportion to solve this.

Let x be the number of muffins that can be made with 5 cups of flour

4 cups = 12 muffins

5 cups =   x

cross-multiply

4×x = 12 × 5

4x = 60

Divide both-side of the equation by 4

 =  

(On the left-hand side of the equation, 4 on the numerator will cancel-out 4 on the denominator, while on the right-hand side of the equation 60 will be divided by 4)

x = 15 muffins

15 muffins can be made with 5 cups of flour.