Answer: (12, 0) or (30,0).
Step-by-step explanation: Depends on which quiz you're taking. The answer to this problem is (12,0). (30,0) is the answer to the question which has the system of inequalities as :
s ≤ 40 - 3t
s ≥ 12 - t
s ≤ 30 - t
s ≥ 0
t ≥ 0