their product is 30

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

their product is 30

by sanju09 » Wed Feb 18, 2009 6:19 am

What is the value of X, if X and Y are two distinct integers and their product is 30?
1. X is an odd integer
2. X > Y

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Source: Beat The GMAT — Data Sufficiency | Wed Feb 18, 2009 6:19 am

x2suresh: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Aug 07, 2008 5:32 am; Thanked: 16 times

Re: their product is 30

by x2suresh » Wed Feb 18, 2009 6:43 am

sanju09 wrote:What is the value of X, if X and Y are two distinct integers and their product is 30?
1. X is an odd integer
2. X > Y

What is the value of X, if X and Y are two distinct integers and their product is 30?
1. X is an odd integer
2. X > Y

1) 1*30, 3*10 multiple values not sufficient
2) 30*1 10*3 multiple vaues not sufficient

combined

odd factors of 30 1,3,5,15

only when X=15 Y=2 statifies X>Y

sufficient

C

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Wed Feb 18, 2009 9:13 am

My ans is (E).
The statement doesn't say that X, Y are positive, hence they could also be negative.

So:

X Y

30 1
-30 -1
15 2
-15 -2
10 3
-10 -3
1 30
-1 -30
2 15
-2 -15
3 10
-3 -10

Stat A is clearly ins.
Stat 2 is ins. too

A+B is ins. as well, because from the table above we have that -1 and -3 are both odd and > than y (-30 and -10 respectively).

Makes sense?

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x2suresh: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Aug 07, 2008 5:32 am; Thanked: 16 times

by x2suresh » Wed Feb 18, 2009 9:18 am

mjjking wrote:My ans is (E).
The statement doesn't say that X, Y are positive, hence they could also be negative.

So:

X Y

30 1
-30 -1
15 2
-15 -2
10 3
-10 -3
1 30
-1 -30
2 15
-2 -15
3 10
-3 -10

Stat A is clearly ins.
Stat 2 is ins. too

A+B is ins. as well, because from the table above we have that -1 and -3 are both odd and > than y (-30 and -10 respectively).

Makes sense?

you are right!

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cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pm; Thanked: 331 times; Followed by:11 members

by cramya » Wed Feb 18, 2009 4:54 pm

Mjjking,
You are very correct on E IMO. Good observation and no wonder u have a 680 to begin with....

Definition of odds and even extend to negative numbers also

Even with both the statements x could be 15 wiht y=2 or x=-5 y=-6.

Regards,
CR