Question

A salt solution containing 2 grams of salt per liter of water is poured into the...

A salt solution containing 2 grams of salt per liter of water is poured into the tank at a rate 3 liter/min where initially contains 30 liters of pure water. The mixture then was drained at the same rate as its poured into the tank. Solve,
Hint:
(??(?) = ???????? ????????????? (??) × ???? ???? (??)? − ????(???? ????????????? (???) ×
i. the initial-value problem that describes the amount of salt in the tank for t > 0
??
???? ???? (???)
ii. the amount of salt in the tank after 20 minutes.
iii. the amount of salt in the tank after a long time (t → ∞)

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