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10g=xcm3
1g=xcm3
1:8,9=0,112 <- 1cm3/g
0,112*10=1,12cm3 <- 1g=0,112cm3
____________
7,9g=1cm3
90g=xcm3
1g=xcm3
1:7,9=0,127 <- 1cm3/g
0,127*90=11,43cm3 <- 1g=0,127
____________
10g+90g=100g
1,12cm3+11,43cm3=12,55cm3
100g:12,55=7,97g/cm3
Odp.:Gęstość otrzymanego stopu wynosi 7,97g/cm3