Daphney buys 5 kg of potatoes at the supermarket. If 2 kg of potatoes costs $6, how much will she pay?
Thoughts? Step-by-step reasoning:
The price per kilogram of potatoes is $6 / 2 = $3. To buy 5 kg of potatoes, she will have to pay 5 * $3 = $15.
Thus, the answer is 15.