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y - Staś
y- ilość żetonów Jasia
y + 10 = x - 10
x - y = 20
y= 20 + x
2(x -10) = y +10
2x -20 = y + 10
2x - y = 30
2(x -10) - y = 30
2x -20 - (20 + x) = 30
2x -20 - 20 -x = 30
x = 70
y = 70 - 20 = 50
Razem : 70 + 50 = 120 żetonów
spr.
70 - 10 = 60 60 = 60 L +P
70 +10 = 2*(50 -10) 80 =2*40 80 = 80 L= P