Christmas trees

Salesman sold Christmas trees: spruce for € 22, pine for € 25 and fir for € 33. At the morning he had the same number of spruce, fir and pine. At the evening he had all the trees entirely sold for € 3,600. How many trees that day salesman sold?

Correct result:

x =  135

Solution:

$$\begin{gathered} a=22+25+33=80 \\ b=3600\mathrm{/}a=3600\mathrm{/}80=45 \\ x=3\cdot b=3\cdot 45=135 \end{gathered}$$

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