Question

Daca x+y+z+u=106, (x+y)-10=z+u, x+4=y si u-8=z cu cat este egal x+y, y=?, z=? si u=?

Answer 1

2x+4+2u-8=106
2x+2u-4=106
2(x+u)=110
x+u=55
2x-6=2u-8
2(u-x)=2
u-x=1
x+u=55
2u=56
u=28
x=27
y=31
x=y=38