L=2.43* W^0.3326, What Is L If W Is 2.72 Oz?

W = 2.72 oz
L = 2.43 * 2.72^ 0.3326
= 3.3896 oz

Now converting it in to inches

1 oz = 1.80468 cubic inch therefore

3.3896 oz = 3.3896*(1.8046)
  = 6.1168 cubic inch
Now converting to inch take 3^rd root of (6.1168)
= 1.829 inch >>> Answer

By no means, you can get 12 inches as an answer.