Question

Bjorn is baking his favorite dessert. The recipe calls for 5/8 of a cup of butter, but he wants to double the recipe. How much butter will Bjorn need?

Answer 1

The recipe calls for 5/8 of a cup of butter

That means 1 recipe needs 5/8 cup of butter

If the recipe is double means

2 recipes need how many cups of butter

By using the ratio method

Recipe: butter

1 : 5/8

2 : x

By using cross multiplication

`\begin{gathered} 1* x=2*(5)/(8) \\ x=(10)/(8) \end{gathered}`

x is the number of cups of butter

We will change it to a mixed number

`(10)/(8)=1(2)/(8)=1(1)/(4)`

Double the recipe needs 1 1/4 cups of butter

Bjorn needs 1 1/4 cups of butter (5/4 cups of butter)