13.322. Bees, when processing flower nectar into honey, remove a significant portion of the water. Studies have shown that nectar usually contains about $70 \%$ water, while the honey obtained from it contains only $17 \%$ water. How many kilograms of nectar do bees need to process to obtain 1 kg of honey?
Solution.

Let 1 kg of honey be obtained from $x$ kg of nectar. After removing water from the nectar, 300 g of other substances remain for each kilogram, and after removing water from the honey - 830 g per kilogram. We have $300 x=830$, from which $x \approx 2.77$ (kg).

Answer: $x \approx 2.77$ kg.