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Multiple choice

If x = y = 2z and xyz = 256, then what is the value of x?

  1. 12

  2. 8

  3. 16

  4. 6

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Given x = y = 2z and xyz = 256. Let z = k, then x = y = 2k. So xyz = (2k)(2k)(k) = 4k^3 = 256, giving k^3 = 64, so k = 4. Therefore x = 2k = 8.

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