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Populations of City Y and Z.

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Populations of City Y and Z.

by harsh.champ » Wed Feb 17, 2010 6:22 am
What are the populations of Cities Y and Z ?

(1) The population of City Z is 275,000 more than the population of City Y.
(2) The ratio of the population of City Z to the population of City Y is 76 to 21.
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by arzanr » Wed Feb 17, 2010 8:07 am
1) Insufficient
2) Insufficient

TOGETHER they are sufficient
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by outreach » Wed Feb 17, 2010 10:44 am
1.

population of City Y= X
population of City Z= X+275,000

we do not know X, hence insuffcient


2.
we know the ratio but not the exact number


1 and 2
(population of City Z/population of City Y) =76/21
(X/X+275,000)=76/21

by solvin we can find X and hence the population of City Z
hence answer is C
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by shashank.ism » Wed Feb 17, 2010 12:26 pm
harsh.champ wrote:What are the populations of Cities Y and Z ?

(1) The population of City Z is 275,000 more than the population of City Y.
(2) The ratio of the population of City Z to the population of City Y is 76 to 21.
St.1: Z= 275000+ Y. but we can't say about exact populations. - insufficient...
St.2: Z/Y = 76/21 total not known - - insufficient...
combined two eq two unknown sufficient....Ans C
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