Răspunsuri

2014-02-09T18:13:30+02:00
100%=nr elevi=12+18=30
30.......100
12......x
x=12*100/30=40%
la al doilea  caz poti sa ffaci diferennta
2014-02-09T19:35:31+02:00

X=nr procentaj baieti

Y=nr procentaj fete
X% inmultit cu (12+18)=12

X/100=12/30

X=(12x100)/30

X=1200/30

X=40%=>Y=60%

1 5 1