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3x = masa miedzi
x + 3x = 24
4x = 24 /: 4
x = 6
3x = 3* 6 = 18 kg
18
-----
24
=0,75
0 ,75 = 75 procent
Odp . Masa cynku to 6 kg,a zawartość procentowa miedzi to 75.
3x masa miedzi
3x+x=24
4x=24
x=6
masa cynku wynosi 6kg
3x6=18 kg
masa miedzi wynosi 18 kg
24-100%
18-x
x=(18x100):24
x=75%
zawartość midzi w stopie wynosi 75%