BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course
Redeem
Featured Course
Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.
You are right DanaJ. Will you please explain me the art of hiding any text, by using spoiler?DanaJ wrote:1. (x + y) {(1/x) + (1/y)} = [(x + y)^2]/xy = 4. This means that (x + y)^2 = 4xy or that x^2 + y^2 + 2xy = 4xy. Take 4xy on the other side and you get that:
x^2 + y^2 - 2xy = 0
(x - y)^2 = 0
This is true onyl when x - y = 0 or x = y. So 1 is sufficient.
2. (x – 50)^2 = (y – 50)^2 means that you have two cases:
a. x - 50 = y - 50, making x = y
b. x - 50 = -(y - 50), making x <> y.
Since you can't tell between the two, then 2 is insufficient.
So I'd say A
Thanks DanaJ, but I am still not sure what I am going to do with this. A link wanted me post OAs with my questions, so I am now going to try spoiler for the first time, check it out in my next few posts on "Problem Solving Forum"DanaJ wrote:)
It's not an art... You just use the spoiler function when you post (it's right over there under the title). Don't forget to un-tick the "Disable BBCode in this post" (right under the space where you write).
Sanju,sanju09 wrote:Thanks DanaJ, but I am still not sure what I am going to do with this. A link wanted me post OAs with my questions, so I am now going to try spoiler for the first time, check it out in my next few posts on "Problem Solving Forum"DanaJ wrote:
It's not an art... You just use the spoiler function when you post (it's right over there under the title). Don't forget to un-tick the "Disable BBCode in this post" (right under the space where you write).
. What is source??New here Create free account
