interesting DS

[tytyros]

What is the cube root of

w ?
(1) The 5th root of w is 64.
(2) The 15th root of w is 4.
Official Answer: D

What is the cube root of

w ?
(1) The 5th root of w is 64.
(2) The 16th root of w is 4.

[nazar]

Stem1:
w^1/5 =64
w^(1/5)*5 =64^5
w=64^5. SUFF.
Stem2:
w^1/16 =4
w^(1/16)*16 =4^16
w=4^16. SUFF.
Answer is D.