Last visit was: 07 Nov 2024, 05:33 It is currently 07 Nov 2024, 05:33

Close

GRE Prep Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GRE score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12178 [14]
Given Kudos: 136
Send PM
avatar
Retired Moderator
Joined: 20 Aug 2020
Posts: 49
Own Kudos [?]: 59 [3]
Given Kudos: 0
Send PM
Verbal Expert
Joined: 18 Apr 2015
Posts: 29901
Own Kudos [?]: 36142 [0]
Given Kudos: 25888
Send PM
Retired Moderator
Joined: 16 Apr 2020
Status:Founder & Quant Trainer
Affiliations: Prepster Education
Posts: 1546
Own Kudos [?]: 3210 [1]
Given Kudos: 172
Location: India
WE:Education (Education)
Send PM
xy + 5x + 2y + 9 is even [#permalink]
1
GreenlightTestPrep wrote:
x and y are positive integers
xy + 5x + 2y + 9 is even

Quantity A
Quantity B
The remainder when x is divided by 2
The remainder when y is divided by 2


A) The quantity in Column A is greater.
B) The quantity in Column B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.


\(x > 0\) and \(y > 0\) and \(xy + 5x + 2y + 9 = even\)

\(2y = even\)
\(9 = odd\)

So, \(xy + 5x = even\)
As, \(even + even + odd = even\)

Now, if \(xy\) is even then \(x\) has to even and \(y\) has to be odd

Now,
Col. A: Remainder greater than 0
Col. B: Remainder 0

Hence, option A
avatar
Intern
Intern
Joined: 19 Jun 2019
Posts: 1
Own Kudos [?]: 1 [1]
Given Kudos: 0
Send PM
Re: xy + 5x + 2y + 9 is even [#permalink]
1
i attacked this question in this particular way.... i managed 53 seconds in total.

so xy + 5x +2y + 9 needs to be even and x and y are positive integers .

i would use random positive values for x and y both here
1) x=2 ,y=1 to keep everything even. but 9 here makes it odd. so then one and only ONE of the values needs to be odd for it to equal in total an even value
2) x= 3, y=2... why these two values .. i want my xy to be even. only 5x will end up as odd and my 2y remains even and that 9 value makes the odd value even at the end because odd+odd= even.

now that we have defined our variables we can move to the comparison for divison .

A = reamainder is 1 , B = remainder is 0

A is greater hence Option A
Manager
Manager
Joined: 11 Jun 2023
Posts: 77
Own Kudos [?]: 77 [1]
Given Kudos: 14
Send PM
Re: xy + 5x + 2y + 9 is even [#permalink]
1
How I approached:

\(xy+5x+2y+9=even\)
\(xy+5x+2y=even-9=odd\)
\(xy+5x=odd-2y\)
\(xy+5x=odd\)
Knowing the above:
Notice that if x were even, the equation is invalid - as xy would be an even quantity, and 5x would also be even, and even plus even does not equal an odd value. Therefore, X must not be even.
We can deduce that quantity A is 1.

If x is odd, y may be even - xy=even, 5x=odd, even plus odd is odd.
In this case, quantity A is 1 and quantity B is 0. QA>QB

If x is odd, and y is odd - this is not possible, as xy would be odd and 5x would be odd, and odd+odd is even.

Therefore, we have only the case that x is an odd number, and y is an even number.

QA>QB, so the answer is A.
Prep Club for GRE Bot
Re: xy + 5x + 2y + 9 is even [#permalink]
Moderators:
GRE Instructor
77 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
234 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne