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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?

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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)

User Stuart Rossiter
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