Question

Talia uses 10 strawberries and 4 oranges to make 8 servings of fruit salad. How many oranges and strawberries does Taila needs to make 12 servings?

Answer 1

Since 12 is 8 x 1 1/2 she needs 1 1/2 time as much fruit.


1 1/2 x 10 = 15 strawberries  and 1 1/2 x 4 = 6 oranges.

You could also solve this using proportions:

$\frac{10}{8} = \frac{n}{12}$

Cross multiply and get 8n= 120  divide by 8 and get 15 strawberries

Do the same for the oranges:

$\frac{4}{8} = \frac{n}{12}$

You can see that 4/8 = 1/2 so n/12 has to be 6 to be 1/2 (or solve it using cross products like I did above).