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Štěpán is planting trees. If he had planted 12 trees every hour instead of 9 trees, he would have finished 1 hour earlier. How many stems should he plant?

Correct answer:

n =  36

Step-by-step explanation:

n/9 = n/12 + 1

n = 36

n = 36/1 = 36

n = 36

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