March 2019 0 29 Report
Gdzie zrobiłem błąd?
w odpowiedziach pisze:
x = 30
y = 60

x + y = 90
120%x + 140%y = 90 + 90* 33 1/3%

x + y = 90
1,2x + 1,4y = 120

x + y = 90
1,4y = 120 - 1,2x

x + 120 - 1,2x = 90
1,4y = 120 - 1,2x

-0,2x = -30 / / (-0,2)
1,4y = 120 - 1,2x

x = 6 ???
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