Răspunsuri

2014-02-16T11:48:16+02:00
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
10 4 10
2014-02-16T12:00:42+02:00
Fie x = nr. fete 
x+80%dinx=27
x+ \frac{4x}{y5} =27   /*5
5x+4x=5*27
9x= 135   /:9
x= 15  ----> 15 fete  si 12 baieti
5 2 5