13.044. Sugar and granulated sugar were delivered to the store in 63 bags, totaling 4.8 tons, with the number of bags of granulated sugar being $25 \%$ more than those of sugar. The mass of each bag of sugar was $3 / 4$ of the mass of a bag of granulated sugar. How much sugar and how much granulated sugar were delivered?
Solution.

Let $x$ be the number of bags of sugar; $1.25 x$ be the number of bags of sand. According to the condition, $x + 1.25 x = 63$, from which $x = 28$ bags of sugar; $1.25 \cdot 28 = 35$ bags of sand. Now let the total be $y$ tons of sand; $4.8 - y$ tons of sugar. Then $\frac{y}{35}$ tons is the weight of one bag of sand; $\frac{4.8 - y}{28}$ tons is the weight of one bag of sugar. According to the condition $\frac{3}{4} : \frac{y}{35} = \frac{4.8 - y}{28}$, from which $y = 1.8$ tons of sand; $4.8 - 1.8 = 3$ tons of sugar. Answer: 1.8 and 3 tons.