sets

[gmatmachoman]

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

[Makushr1]

answer?

[gmatmachoman]

answer?

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

[uwhusky]

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 =).

[selango]

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

[kvcpk]

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.