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b)
40g stopu ---- 100%
xg cyny ------ 40%
x = 16g cyny
c) 100% stopu - 40% miedzi = 60% cyny
40g stopu ---- 100%
xg cyny ------ 60%
x = 24g cyny
d)
40g stopu ---- 100%
xg cyny ------ 35%
x = 14g cyny