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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Tue Aug 17, 2010 10:16 am

X percents of the rooms are suits, Y percent of the rooms are painted
light blue. Which of the following best represents the least percentage of
the light blue painted suits?

1) X-Y
2)Y-X +100
3)100X-Y
4)X+Y-100
e)100-XY

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Source: Beat The GMAT — Problem Solving | Tue Aug 17, 2010 10:16 am

Makushr1: Senior | Next Rank: 100 Posts; Posts: 50; Joined: Sun Aug 15, 2010 3:00 pm; Thanked: 4 times

by Makushr1 » Tue Aug 17, 2010 10:38 am

answer?

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Tue Aug 17, 2010 10:42 am

Makushr1 wrote:answer?

where is ur approach dude???clue..use set theory rules for 2 components...

R&D on GMAT algorithm:

https://www.beatthegmat.com/r-d-on-gmat- ... tml#305739

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uwhusky: Legendary Member; Posts: 1172; Joined: Wed Apr 28, 2010 6:20 pmFollowed by: 4 members; Thanked: 74 times

by uwhusky » Tue Aug 17, 2010 10:46 am

I don't get this question at all...

Is the goal trying to figure out which answer could result in the lowest number? If so, I pick 4 =).

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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 » Tue Aug 17, 2010 10:53 am

Rooms which are suites = X
Rooms which are light blue = Y

XuY=X+Y-Both

Both=X+Y-XuY

Both will be least if XuY is 100% (ie) All the rooms are either suit or either blue painted

Both=X+Y-100

Pick D

--Anand--

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kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

by kvcpk » Tue Aug 17, 2010 11:53 am

gmatmachoman wrote:X percents of the rooms are suits, Y percent of the rooms are painted
light blue. Which of the following best represents the least percentage of
the light blue painted suits?

1) X-Y
2)Y-X +100
3)100X-Y
4)X+Y-100
e)100-XY

calculations not needed.
Assume All rooms are light blue painted and no room is a suit.
y=100, x=0

Common should be 0.
By substituting, only D remains.

"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)

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