Problem 18 of 35alg-018
A trail mix recipe uses nuts and raisins in a ratio of by volume. Lena uses 15 cups of nuts. How many cups of raisins does she need to keep the same ratio?
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Solution walkthrough1:26
- A ratio of means equal parts of nuts for every parts of raisins, all parts the same size.
- The parts of nuts hold cups, so each part is cups.
- Raisin parts are the same size. There are of them, so she needs cups.
- Check: is the same ratio as , because dividing both numbers by gives .
- Traps: subtracts instead of scaling, is the whole mix, and turns the ratio upside down.