janek+magda=70
bartek+magda=55
janek=magda+20
70-20=50
50/2=25
magda-25
janek-45
bartek-55-25=30
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janek+magda=70
bartek+magda=55
janek=magda+20
70-20=50
50/2=25
magda-25
janek-45
bartek-55-25=30
y - magda
z - bartek
x + y = 70
x = y + 20
y + z = 55
2y + 20 = 70 / -20
2y = 50 / :2
y = 25
x = 70 - 25
x = 45
z = 55 - y
z = 30