To find out how many days it will take for the water tank to empty when 1/7 of the tank's capacity is used each day, it will take 7 days.
To find out how many days it will take for the water tank to empty when 1/7 of the tank's capacity is used each day, we can set up the equation:
1/7 * d = 1
Solving for d:
d = 7
It will take 7 days to empty the water tank.
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