The tank

The tank had nine inflows to be filled in 21 days. After nine days, three inflows shut down. How many days did the remaining six tributaries fill the tank?

Correct answer:

d =  18 d

Step-by-step explanation:


9·21= 9·9 +d·6

6d = 108


d = 108/6 = 18

d = 18

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