Question

Se x=1, y=2x e z=2y, o valor de x+y+z é:

Answer 1

x = 1

y = 2x
y = 2.1
y = 2

z = 2y
z = 2.2
z = 4

x + y + z = 

1 + 2 + 4 =
 
   3 + 4 = 7                  ok