## Data sufficiency

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### Data sufficiency

by Nury Yeashfi » Wed Jun 19, 2019 12:10 pm
If y=1+1/x where x>1, then y could equal to which of the following?
a. 1/5
b. 5/8
c. 9/7
d. 15.11
e. 8/7

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by [email protected] » Wed Jun 19, 2019 12:47 pm
Nury Yeashfi wrote:If y = 1 + 1/x where x >1 , then y could equal to which of the following?
a. 1/5
b. 5/8
c. 9/7
d. 15.11
e. 8/7
Take: y = 1 + 1/x
Rewrite as: y = x/x + 1/x
Simplify: y = (x + 1)/x

So, we're looking for an answer choice that can be expressed as a fraction in which the numerator is 1 greater than the denominator.
Answer: E

Cheers,
Brent

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by Ian Stewart » Fri Jun 28, 2019 6:52 am
If x > 1, then 1/x is between 0 and 1. So 1 + (1/x) will be between 1 and 2, and answers C and E are both possible (for C, x = 7/2, and for E, x = 7). If there's a typo in D, and instead it's meant to read "15/11", then D is also possible (x = 11/4). It's only if the question tells you x is an integer that E becomes the lone correct answer among the choices, but the question doesn't tell us that.

So the question has two or three right answers, which can't happen on the GMAT - where is it from?
If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

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by oabpyhfv » Sat Jul 20, 2019 12:25 am
In the figure below AB=BC=CD. If the area of the Traingle CDE is 42,what is the area of the triangle ADG?
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similar triangle sides of CDE are 1/3 of the Side of ADG.
9 X Area of triangle CDE = area of Triangle ADG

Area of Triangle ADG =9 X 42

Area of Triangle ADG =378

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