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shekar123: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sun May 10, 2009 10:26 am

by shekar123 » Sat May 29, 2010 8:54 pm

Is x > y ?

(1) x = y - 1
(2) x/3 = y - 5

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Source: Beat The GMAT — Data Sufficiency | Sat May 29, 2010 8:54 pm

boazkhan: Master | Next Rank: 500 Posts; Posts: 135; Joined: Tue Oct 13, 2009 10:27 am; Thanked: 3 times

by boazkhan » Sat May 29, 2010 9:46 pm

IMO A ...OA?

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clock60: Legendary Member; Posts: 759; Joined: Mon Apr 26, 2010 10:15 amFollowed by: 3 members; Thanked: 85 times

by clock60 » Sun May 30, 2010 1:32 am

also got A
is x-y>0
(1)x=y-1
y-1-y=-1<0
suffiicent
(2)x/3+5=y
x-x/3-5=(2x-15)/3
the sign depends on the value of x
so insuffiicent

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sun May 30, 2010 2:12 am

From statement 1 , x=y-1 or y=x+1 -->y is always greater than x,Sufficient.

From statment 2,

x/3=y-5

x=3y-15

If y=7,x=6,x<Y

y=8,x=9,x>y

y=-1,x=-18,x<y

Insufficient.

Hence answer is A

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amitu: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Mon Apr 12, 2010 4:59 am

by amitu » Mon May 31, 2010 2:13 am

IMO C

a) if y is +ve then x=y -1 => x > y

if y is -ve then x = y -1 => x < y ( y = -3 , x = -4 )

b) not suff

but combining we can solve the equation

key in a is sign of y .

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Mon May 31, 2010 2:19 am

amitu wrote:IMO C

a) if y is +ve then x=y -1 => x > y

if y is -ve then x = y -1 => x < y ( y = -3 , x = -4 )

b) not suff

but combining we can solve the equation

key in a is sign of y .

If y is +ve,from x=y-1,y>x.

if y=4,x=3

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blaster: Master | Next Rank: 500 Posts; Posts: 233; Joined: Mon Jun 09, 2008 1:30 am; Thanked: 5 times

by blaster » Mon May 31, 2010 10:15 pm

i don't know how statement 1) can be sufficient. the question not stated that x and y positive.

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4GMAT_Mumbai: Master | Next Rank: 500 Posts; Posts: 161; Joined: Mon Apr 05, 2010 9:06 am; Location: Mumbai; Thanked: 37 times

by 4GMAT_Mumbai » Mon May 31, 2010 10:25 pm

i don't know how statement 1) can be sufficient. the question not stated that x and y positive.

The positivity or negativity of x or y does not matter.

Thinking in terms of the number line helps. (x = y-1) implies that wherever y is; x is one unit to its left. There is no dependence on the positivity or the negativity of x or y. Hence, x is always less than y.

Hope this helps. Thanks.

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