BTGmoderatorDC wrote: ↑Tue Feb 26, 2019 9:36 pm
What is the cube root of w?
(1) The 5th root of w is 64.
(2) The 15th root of w is 4.
OA
D
Source: Official Guide
Target question: What is the cube root of w?
Statement 1: The 5th root of w is 64.
ASIDE: If the square root of x = 7, then x = 7²
If the cube root of x = 10, then x = 10³
If the fourth root of x = 6, then x = 6⁴
etc
So, if the 5th root of w is 64, then w = 64⁵
Since we COULD determine the actual value of w, we COULD find
the cube root of w
In other words, we have all of the information we need to answer the
target question with certainty
Statement 1 is SUFFICIENT
Statement 2: The 15th root of w is 4
From this we can conclude that w = 4¹⁵
Since we COULD determine the actual value of w, we COULD find
the cube root of w
In other words, we have all of the information we need to answer the
target question with certainty
Statement 2 is SUFFICIENT
Answer: D
Cheers,
Brent
