rate question

[Forte]

100L tank is initially half full with a salt solution with a conc of (6g/L). A salt solution(36g/L) starts flowing  into the tank at a rate (6g/L). Simultaneously, the mixture leaves the tank at a rate of (3g/L)

I need to find the d.e for x(t) amount of salt in tank after t minutes.

Thanks

[brightsky]

assuming you mean at a rate of 6 L/min, or something
dx/dt = dx/dt_in - dx/dt_out
= (dx/dV * dV/dt)_in - (dx/dV *dV/dt)_out
= (36 * 6) - (x/(50 + 3t) * 3)
= 216 - 3x/(50+ 3t)
that's your diff equation.

[Forte]

It was 6g/L. I just got the answer, the way to do this is actually not in the course, so don't worry about this anymore.