Question

A recipe that makes 8 servings calls for 3/5 cup of flour. Jeff modifies the recipe so that it can serve 10. How many cups of flour will Jeff need?

Answer 1

8 goes with 3/5: 10 goes with n     (n being the number of cups)

$\frac{8}{3/5} = \frac{10}{n}$

Use cross products and we get  8n = 6
Now divide by 8
8n  = 6
8       8

n= 6/8 or 3/4 of a cup of flour.