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y - solanka w beczce
1/2x + y = 40 kg |* 2
0,1x/2 + 0,02y = 1,2 kg |* 2
x + 2y = 80 kg
0,1x + 0,004y = 2,4 kg |* (-10)
x + 2y = 80 kg
-x - 0,4y = -24 kg
1,6y = 56 kg
y = 35 kg
1/2x + 35 = 40|* 2
x + 70 = 80
x = 10 kg
odp: W wiadrze jest 10 kg solanki a w beczce 35 kg solanki.