Răspuns :
b = 80/100 x f (b - baietii , f-fetele)
b = 4/5 x f
4/5 x f + 5/5 x f = 27
9f : 5 = 27
9f = 135
f = 135 : 9 = 15
b = 27 - 15 = 12
b = 4/5 x f
4/5 x f + 5/5 x f = 27
9f : 5 = 27
9f = 135
f = 135 : 9 = 15
b = 27 - 15 = 12
fie x = nr. fete
x+80%dinx=27
x+[tex] \frac{4x}{y5} [/tex]=27 /*5
5x+4x=5*27
9x= 135 /:9
x= 15 ----> 15 fete si 12 baieti
x+80%dinx=27
x+[tex] \frac{4x}{y5} [/tex]=27 /*5
5x+4x=5*27
9x= 135 /:9
x= 15 ----> 15 fete si 12 baieti