gmat prep

Atult718 · Posted: Tue Sep 04, 2007 9:19 pm Post subject: gmat prep

hepl guys

beatthegmat · Posted: Tue Sep 04, 2007 9:30 pm Post subject:

Whenever it's possible, please type out your questions instead of taking a screenshot.

Typed text allows for guests to see the question (they can't see attachments otherwise) and encourages them to participate as well. Also, attachments aren't searchable for future reference.

Thanks.

agps · Posted: Wed Sep 05, 2007 3:25 am Post subject:

minimum pop for least populated would be 1 village with exacly 10% less than all the rest.
backsolve.
B) 10.800 + 10% = 11.880
11.880*10+10.800 = 118.800+10.800 = 129.600, not the same total, wrong

D)11.000 + 10% = 12.100
12.100*10+11.000 = 121.000+11.000 = 132.000, same as total, D is the answer

in backsolving there are many strategies, i always try (if the result sets are ordered, which they usually are) first B, if the result is larger than expected A is the answer (always confirm), if the result is less than expected try D, aplly the same reasoning untill you find the answer.

ri2007 · Posted: Wed Sep 05, 2007 3:18 pm Post subject:

another method would be to assume the county with the minimum popolation is X

and all other are 10% more than X.

So X + 4( 1.1X) = 132000

so 12X =132000
X = 11000

agps · Posted: Wed Sep 05, 2007 4:16 pm Post subject:

"So X + 4( 1.1X) = 132000

so 12X =132000 "
I believe you mean
So X + 10( 1.1X) = 132000
so 12X =132000

good way to solve it by the way. Cool

ri2007 · Posted: Wed Sep 05, 2007 5:13 pm Post subject:

yup, it 10 not 4, thanks for correcting that