Data Sufficiency

hi guys,

would someone help me with the strategy and approach to the DS question #15 on the new OG

"What is the cube root of w?"

(1) The 5th root of w is 64
(2) The 15th root of w is 4

The correct answer is (D), however I frankly don't understand the approach.

patheinemann wrote:hi guys,

would someone help me with the strategy and approach to the DS question #15 on the new OG

"What is the cube root of w?"

(1) The 5th root of w is 64
(2) The 15th root of w is 4

The correct answer is D and here's why:

In the question stem it is asking for the cube root of w. which is equal to w^(1/3)

1) The 5th root of w is 64 this means w=64^5; we can now calculate the cube root of w. [(64^5)^1/3] This is sufficient. Remember in DS questions we don't actually have to find the answer.

2) This is sufficient for the same reason that 1 is; w=4^15 so [(4^15)^1/3]

Let me know if this helps

Excellent. My approach problem had to do on leaving w alone as a variable.

Thanks and by the way alex.gellatly do you know if videos for OG 13 are available. Haven´t found them yet.