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x = 0,1x + 0,18
0,9x = 0,18
x = 0,2 kg
b) 0,95 * 2 + x = 0,98 * (2 + x)
1,9 + x = 1,96 + 0,98x
0,02x = 0,06
x = 3 kg
c) 0,05 * 9 + x = 0,1 (9 + x)
0,45 + x = 0,9 + 0,1x
0,9x = 0,45
x = 0,5 kg
d) 0,3 * x = 0,2 (x + 20)
0,3x = 0,2x + 4
0,1x = 4
x = 40 kg
40 + 20 = 60 kg
proste ;)