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3x = 450
X = 150
2x=2×150=300
答：略
动脑筋：解：设乙收x吨，那么甲收(x+12.5)吨，丙收(x+X+12.5-25=2x-12.5) 吨
(x+12.5)+x+(2x-12.5)=130
4x = 130
X = 32.5
甲：x+12.5=32.5+12.5=45
丙：2x-12.5=2×32.5-12.5=52.5
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