Christmas trees

The salesman sold Christmas trees: spruce for € 22, pine for € 25, and fir for € 33. In the morning, he had the same number of spruce, fir, and pine. In the evening, he had all the trees sold for € 3,600. How many trees does the day salesman sell?

Correct answer:

x =  135

Step-by-step explanation:

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

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