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9.jpg

The photo that I attached is the question, and I am really

confused...

9.jpg

9. A tank contains look of a sugar solution with an initial concentration
of 59/L. Sugar Solution of concentration 109/L is pumped into the
tank at a rate of 51 / min, and the mixture is pumped out at the
same rate.
a ) Write down an initial value problem satisfied by the mass met)
of sugar in the tank at time t.
b) Find an expression for met).
Isn't this a rate of change question? How is this an
integration question ? Am I suppose to think it as
differential equation ?

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