Răspuns :
a- fete
b- baieti
a+b=27
b=80/100a
80/100a+a=27
4a+5a=135
a=15 fete
b=27-15
b=12 baieti
b- baieti
a+b=27
b=80/100a
80/100a+a=27
4a+5a=135
a=15 fete
b=27-15
b=12 baieti
f + b = 27
b = 80 f /100
f + 80 f/100 = 27
100 f + 80 f = 2700
180 f = 2700
f = 2700 : 180
f = 15 fete
b = 27 - 15
b = 12 baieti
b = 80 f /100
f + 80 f/100 = 27
100 f + 80 f = 2700
180 f = 2700
f = 2700 : 180
f = 15 fete
b = 27 - 15
b = 12 baieti