# A double recipe of cookies calls for 5 cups of flour which proportion could be used to find the amount of flour for a triple recipe?

Nov 27, 2016

You would need 7.5 cups of flour for a triple recipe.

#### Explanation:

Because 5 couples of flour are needed for a double recipe we can write the ration as $5 : 2$.

To solve for a triple recipe we can write an equation as:

$5 : 2 = c : 3$

or

$\frac{5}{2} = \frac{c}{3}$

$3 \cdot \frac{5}{2} = 3 \cdot \frac{c}{3}$

$\frac{15}{2} = c$

$c = 7.5$