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b- płaca pana Bartka
a-b=150
a-a*1/20=b+b*1/10
a-b=150
19............11
-...a....= ....-b ...........ułamki
20.............10
a=150+b
19.....................11
- ...*(150+b)...=......-b
20......................10
a=150+b
..........19......22
142,5+...-b...-..- b = 0
...........20.....20
a=150+b
..........3
142.5-..-b =0../*20
..........20
2850=3b
b =950
a=150+b
a=150+950
a=1100
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