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A fish tank initially has 4kg of salt dissolved in 100L of water.

I thought dx/dt = -10x

But i got the answer wrong

water remains constant at 100L. Only salt concentration changing with time

Yep

So concentration = 100x?

i think it will be dx/dt = 4 - 0.4t

sorry 100 dx/dt = 4 - 0.4t

I got the solution, it says 10dx/dt + x = 0

But i dont know how they got that