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⅓(x-y)=¼x
x+y=3000
⅓x-⅓y=¼x/*3
x+y=3000
x-y=¾x
x+y=3000
¼x-y=0
1¼x=3000
x=2400
y=3000-2400
y=600
x=2400
y=600
(x-y):3 = x:4
y= 3000 - x
(x - 3000 + x) :3 = x : 4
2/3x - 1000 = 1/4x
8/12x - 1000 = 3/12x
5/12x = 1000 / * 12
5x = 12000 / :5
x = 2400
y = 600