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x = 1/7x + y
x+y=240 /*6
6/7x=y /*7
6x+6y=1440
6x=7y /*(-1)
6x+6y=1440
-6x+7y=0
13y=1440
y=111 kg
x=240-111=129 kg
y=2 worek 129 kg
x = 1/7x+y
x-1/7x=6/7x
6/7x=y\*7
6x=7x
240*6=1440
1440=13y\:13
111=y
240-111=129