If x=y=2z and xyz=256 then what is the value of x? Choose the most appropriate option.
A) 12 B) 8 C) 16 D) 6 E) 2

Rationale: given that x = y = z . so , x = y , x = 2 z , y = 2 z . given xyz = 256 = > ( 2 z ) * ( 2 z ) * z = 256 = > 4 z ^ 3 = 256 = > z = 4 then x = 2 z = 2 ( 4 ) = 8 answer : b
Answer: B