# 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?

Result

d =  18 d

#### Solution:

9*21= 9*9 +d*6

6d = 108

d = 18

Calculated by our simple equation calculator.

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#### To solve this verbal math problem are needed these knowledge from mathematics:

Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

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