Algebra
Ratios and proportion
A ratio compares two quantities. For directly proportional quantities the quotient stays the same, for inversely proportional ones the product does.
What you need first
Why
The pancake recipe is for 4 people, but you are expecting 10. How much flour do you need?
Doubling everything is easy, but 10 is not a multiple of 4. Still, it should taste the same: the amounts have to stay in the same ratio.
With a ratio table you work out every amount via one person, or via a clever step in between, without guessing.
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