两箱苹果30千克,甲箱卖掉2千克后,剩下的与甲箱中的苹果的比是2:5,设甲箱原来有 x ,乙有 30-x
x -2 :30-x = 2:5
5x - 10 = 60 - 2x
7x = 70
x =10
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