Answer:
All but the one on the bottom left
Answer:

Step-by-step explanation:
We are given that
Volume of water in fish pond,V=3000 L
Mass of toxic chemical=5 kg
Rate=200L/min
Removes chemical=50%
We have to find the differential equation for the time.
Let mass of toxic at any time t= m kg
Rate=Rate in-Rate out



(5, 3) is your answer hope this helps!
Your answer should be 57.7 Hope this helped!!!
I wish you the best of luck sir