Question

x supra 2 = y supra 11= z supra 7 si x+y+z=80

Answer 1

x/2=y/11=z/7=K

x/2=k/1 => x= 2k
y/11=k/1 => y=11k
z/7= k/1 => z=7k

x+y+z= 80
2k+11k+7k=80
20k=80
k= 80/20
k=4 =>
x= 2 * 4 = 8
y= 11 * 4 = 44
z= 7 * 4= 28
Verificare: 8+ 44+ 28= 80. 

Spor la teme. :)