Question

Afla numerele x,y,z,t care satisfac simultan conditiile: x+y+z=1500
y+z+t=1400
x+y+z+t=2200
x+y=1100

Answer 1

3y+2z+2t+2x=y+2y+2z+2t+2y=y+2(z+t+y+x)=y+4400
y+4400=4700
y=4700-4400
y=300
x=1100-300
x=800
z=400
t=1400-(y+z)
t=1400-700
t=700