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If x = y = 2z and xyz = 256 then...

This question belongs to Arithmetic Ability Simplification
Simplification
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If x = y = 2z and xyz = 256, then x = ?

Answer & Solution
Correct Answer: Option C
xyz = 256 ⇒ (2z) (2z) z = 256 ⇒ 4z3
= 256 ⇒ z3 = 64 ⇒ z = 4
∴ x = 2z = (2 × 4) = 8
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