Question: Two Unknown Values

next video

return to
module page

flag video to
rewatch later

Comment on Two Unknown Values

i can't understand why its

anusha777 - June 3, 2018

i can't understand why its option 'D'

Let's keep going from where

greenlight-admin - June 4, 2018

Let's keep going from where we have: x + y = (6.25)(8)

Evaluate to get: x + y = 50

Now that we know the sum is 50, how can we determine which value (x or y) is greater?

Consider these two case...

case i) x = 1 and y = 49 (this satisfies the condition that x + y = 50)
In this case, Quantity A is greater than Quantity B

case ii) x = 40 and y = 10 (this satisfies the condition that x + y = 50)
In this case, Quantity B is greater than Quantity A

Answer: D

Does that help?

Cheers,
Brent

Hey can we think of it this way..... as mean is a generalized value of a set of values and for example we have set (2,4,5,9,15) which has mean 7 so each number in set can be made to 7 like ( 2+4,4+3,5+2,9-2,15-8) so big numbers 15 and 9 redistribute some part to smaller 2,2,5 to make all to 7

Now for the above question we can see mean to be 6.25 so we can say both x and y can be written as 6.25 so answer is C but as we cannot see how much redistribution is done from or to x and y to make 6.25 so CBD

or i do like ur method as well

Your method works perfectly

greenlight-admin - August 15, 2022

Your method works perfectly for this question.
The more ways you have to solve a question, the better!

Have a question about this video?

Post your question in the Comment section below, and a GRE expert will answer it as fast as humanly possible.

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Let me Know

Have a suggestion to make the course even better? Email us today!