The tank

The tank had 9 inflows to be filled in 21 days. After 9 days, 3 trips out. How many days did the remaining 6 tributaries fill the tank?

Correct answer:

d =  18 d

Step-by-step explanation:


9•21= 9•9 +d•6

6d = 108

d = 18

Our simple equation calculator calculates it.



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