jsche229 wrote:Please help me solve the following expression for y: Thanks!
(1/x)+(1/5Y)=(1/2z)
Since the GMAT would provide answer choices, an alternate approach would be to plug in values for x and z and get a target value for y.
Let x=5 and z=2.
The equation becomes:
1/5 + 1/(5y) = 1/4
1/(5y) = 1/4 - 1/5
1/(5y) = 5/20 - 4/20
1/(5y) = 1/20
y = 4.
The target value is y=4.
Now plug x=5 and z=2 into the answer choices to see which yields our target value of 4.
Answer choice: 2xz/(5x - 10z)
(2*5*2)/(5*5 - 10*2) = 20/5 = 4.
Success!
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at
[email protected].
Student Review #1
Student Review #2
Student Review #3
