Răspuns :
in clasa sunt 12+28=40 elevi
[tex] \frac{p}{100}\cdot 40=28 \\ p=28: \frac{40}{100} =28\cdot \frac{100}{40}=70 \\p%=70% [/tex]
[tex] \frac{p}{100}\cdot 40=28 \\ p=28: \frac{40}{100} =28\cdot \frac{100}{40}=70 \\p%=70% [/tex]