172. In the store, there are candies priced at 2 p. per kilogram and 3 p. per kilogram, in equal amounts. At what price should the mixture of these candies be sold?
S o l u t i o n. Let the cost of each type of candy be $s$ rubles. Then the amount of candy priced at 2 p. per kilogram is $\frac{s}{2}$ kilograms, and the amount of candy priced at 3 p. per kilogram is $\frac{s}{3}$ kilograms. Therefore, the price of the mixture is $\frac{2 s}{\frac{s}{2}+\frac{s}{3}}=2.4 \mathrm{p}$.

A n s w e r: 2.4 p.