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2Qd = 240 - 2P
2P = 240 - 2Qd
Ps = 30 + 1/2 Q
2P = 60 + Q
240 - 2Q = 60 + Q
180 = 3Q
Q = 60
P = 30 + 1/2 (60)
= 30 + 30 = 60
Jawabannya B