Casino Royal

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shashank.ism: Legendary Member; Posts: 1022; Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members; Location: Gandhinagar; Thanked: 41 times

by shashank.ism » Sat Feb 06, 2010 8:55 am

Three men are gambling in Casino Royal. They start with sums of money in the ratio 7 : 6 : 5 and finish with sums of money in the ratio 6 : 5 : 4, in the same order as before. One of them won $ 12. How many dollars did he start with ? [The three men gambled amongst each other, only]

a) $1080
b) $420
c) $210
d) $108

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thephoenix: Legendary Member; Posts: 1560; Joined: Tue Nov 17, 2009 2:38 amFollowed by: 5 members; Thanked: 137 times

by thephoenix » Sat Feb 06, 2010 9:14 am

IMO B

the total money at start=the total money at end=x
at start
7:6:5
1st per have=7x/18

2nd=x/3
3rd=5x/18

at end
1st=6x/15
2nd=5x/15=x/3
3rd=4x/15

diff of
1st=x/90
2nd=0
3rd=-ve
hence only the 1st one wins
hence
x/90=12--->x=1080---->1st one has 420

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ajith: Legendary Member; Posts: 1275; Joined: Thu Sep 21, 2006 11:13 pmFollowed by: 2 members; Location: Arabian Sea; Thanked: 125 times

by ajith » Sat Feb 06, 2010 9:25 am

shashank.ism wrote:Three men are gambling in Casino Royal. They start with sums of money in the ratio 7 : 6 : 5 and finish with sums of money in the ratio 6 : 5 : 4, in the same order as before. One of them won $ 12. How many dollars did he start with ? [The three men gambled amongst each other, only]

a) $1080
b) $420
c) $210
d) $108

Let me call them A B C they had x money in total
A had (7/18)x; B had (1/3)x and C had (5/18)x at the start
in the end
A has (6/15)x B has (1/3)x and C has (4/15)x at the start

A gained (6/15)x -(7/18)x
= x (1/90)
x/90 =12
x = 12*90
he started with (7/18)*(12*90)

60*7 = 420
IMO, B

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jona55ssn: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Mon Mar 04, 2013 10:17 am

by jona55ssn » Tue Mar 05, 2013 12:46 pm

I think it was option - B

I wondered if anyone could recommend a casino hire company, we want a blackjack and roulette table at our wedding for after the meal and before the band start so that there is something to fill in the time in between as I know quite often there is a bit of lull after the wedding breakfast? I've got some quotes already but obviously a recommendation from someone would be much better!!

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Tue Mar 05, 2013 1:45 pm

jona55ssn wrote:I think it was option - B

I wondered if anyone could recommend a casino hire company, we want a blackjack and roulette table at our wedding for after the meal and before the band start so that there is something to fill in the time in between as I know quite often there is a bit of lull after the wedding breakfast? I've got some quotes already but obviously a recommendation from someone would be much better!!

I recommend Yorkshire Casino Hire!
I learned all about it in your signature

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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