13.030. Three brigades of workers built an embankment. The entire work is valued at 325500 rubles. What salary will each brigade receive if the first one consisted of 15 people and worked for 21 days, the second one - of 14 people and worked for 25 days, and the number of workers in the third brigade, which worked for 20 days, exceeded the number of workers in the first brigade by $40 \%$?
## Solution.

Let $x$ rubles be received by one person for one day of work. Then the first team will receive $x \cdot 15 \cdot 21$ rubles; the second - $x \cdot 14 \cdot 25$ rubles; the third $x \cdot 1.4 \cdot 15 \cdot 20$ rubles. According to the condition $15 \cdot 21 x + 14 \cdot 25 x + 1.4 \cdot 15 \cdot 20 x = 325500$, from which $x=300$. Therefore, the first team will receive $15 \cdot 21 \cdot 300 = 94500$ rubles; the second $14 \cdot 25 \cdot 300 = 105000$ rubles; the third $1.4 \cdot 15 \times 20 \cdot 300 = 126000$ rubles.

Answer: 126000, 105000, and 94500 rubles.