kerosene oil is put in

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed Mar 02, 2011 1:11 am

A vessel contains 180 liters of petrol. 60 liters are taken out of the vessel every day and an equal quantity of kerosene oil is put in. What quantity of petrol remains in the vessel at the end of three days?
(A) 0 liters
(B) 53&1/3 liters
(C) 66&1/3 liters
(D) 120 liters
(E) 126&1/3 liters

[spoiler]made up[/spoiler]

Last edited by sanju09 on Wed Mar 02, 2011 2:16 am, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Wed Mar 02, 2011 1:11 am

HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Wed Mar 02, 2011 1:50 am

Petrol Keros

120 60 Day 1
80 100 Day 2
53 1/3 Day 3

Ans B 53.33

BarryLi: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Feb 08, 2011 8:55 pm; Location: Canada; Thanked: 7 times; GMAT Score:700

by BarryLi » Wed Mar 02, 2011 1:56 am

The question states that "60 litres of it are taken out of the vessel every day". "It" refers to the petrol. Hence, 60 litres of petrol are taken out of the vessel every day. Are we supposed to realize that kerosene oil cannot be separated from petrol when it is in a vessel?

HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Wed Mar 02, 2011 2:04 am

It refers to "vessel" and not to 180lts of petrol...mixture question... both are extracts from one crude component at various temperatures. it is a possible mixture. Some poor people mix kerosene in petorl to run their vehicles as kerosene in some countries wont go under road tax and is cheap...

BarryLi: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Feb 08, 2011 8:55 pm; Location: Canada; Thanked: 7 times; GMAT Score:700

by BarryLi » Wed Mar 02, 2011 2:07 am

HSPA wrote:It refers to "vessel" and not to 180lts of petrol...mixture question... both are extracts from one crude component at various temperatures. it is a possible mixture. Some poor people mix kerosene in petorl to run their vehicles as kerosene in some countries wont go under road tax and is cheap...

Thanks for the nugget of information.

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed Mar 02, 2011 2:15 am

BarryLi wrote:The question states that "60 litres of it are taken out of the vessel every day". "It" refers to the petrol. Hence, 60 litres of petrol are taken out of the vessel every day. Are we supposed to realize that kerosene oil cannot be separated from petrol when it is in a vessel?

Good point BarryLi, as soon as I realized that, HSPA already came up with their brilliant work under assumption and made me wait for someone of your insight to come forward and object it. Edited man, thanks

The mind is everything. What you think you become. –Lord Buddha

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