A recipe for 4 people uses 280 grams of flour. How much flour is needed for 10 people when every ingredient is scaled equally?

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The serving count is multiplied by 10 divided by 4, or 2.5, so the flour must be 280 times 2.5, which is 700 grams. The 286-gram choice merely adds the six extra people to the flour amount and does not keep the recipe proportions.