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?

Result

x =  135

Solution:

$a=22+25+33=80 \ \\ b=3600/a=3600/80=45 \ \\ x=3 \cdot \ b=3 \cdot \ 45=135$

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