To find out how much sugar Ms. Johnson used while baking the birthday cake, we simply look at the amount of sugar she used. The problem states that she used 12 cups of sugar.
Here's how to approach the problem step by step:
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Identify the initial amount of sugar: According to the problem, there are 78 cups of sugar in the canister.
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Identify how much sugar was used: Ms. Johnson used 12 cups of sugar.
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Calculate the remaining sugar, if needed: If you want to find out how much sugar is left in the canister after Ms. Johnson baked the cake, you could subtract the amount of sugar used from the initial amount:
\[ \text{Remaining sugar} = \text{Initial amount} - \text{Sugar used} \]
Plugging in the values:
\[ \text{Remaining sugar} = 78 \text{ cups} - 12 \text{ cups} = 66 \text{ cups} \]
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Conclusion: The amount of sugar Ms. Johnson used to bake the birthday cake is 12 cups.
So, the final answer is:
Ms. Johnson used 12 cups of sugar.