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waga Małgosi = m
Tworzymy układ równań:
j = m -3
0,85j = m - 15
j = m -3
0,85*(m -3) = m - 15
j = m -3
0,85m - 2,55 = m - 15
j = m -3
-0,15m = -12,45 /:(-0,15)
j = m -3
m = 83
j = 83 - 3 = 80
m = 83