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A city with population of 132,000 is divided into 11 [#permalink]
26 May 2006, 09:30

A city with population of 132,000 is divided into 11 districts and no district is to have a population that is more than 10% greater than the population of any other district. What is the minimum possible population the least populated district could have?

a.) 10,700
b.) 10,800
c.) 10,900
d.) 11,000
e.) 11,100

Obviously the average of a district population is 12000 ( 132000 / 11 )
So for any district that has population less than the average exists another one that balances it ( there could be more than one that balance it exactly against the average , but certainly at least one exists ). That's it for any number less than the average exists another one that is more than the average.

Since for A, B and C certainly exists another district with population more than 10% , they are out.

A city with population of 132,000 is divided into 11 districts and no district is to have a population that is more than 10% greater than the population of any other district. What is the minimum possible population the least populated district could have?

a.) 10,700 b.) 10,800 c.) 10,900 d.) 11,000 e.) 11,100

Obviously the average of a district population is 12000 ( 132000 / 11 ) So for any district that has population less than the average exists another one that balances it ( there could be more than one that balance it exactly against the average , but certainly at least one exists ). That's it for any number less than the average exists another one that is more than the average.

Since for A, B and C certainly exists another district with population more than 10% , they are out.

D is less than E, so D is my answer.

I follow your reasoning up until you rule out A, B, and C. Can you show this mathematically? I'm having a hard time visualizing why you rule out A, B, C but not D.

Obviously the average of a district population is 12000 ( 132000 / 11 ) So for any district that has population less than the average exists another one that balances it ( there could be more than one that balance it exactly against the average , but certainly at least one exists ). That's it for any number less than the average exists another one that is more than the average.

Since for A, B and C certainly exists another district with population more than 10% , they are out.

D is less than E, so D is my answer.

I follow your reasoning up until you rule out A, B, and C. Can you show this mathematically? I'm having a hard time visualizing why you rule out A, B, C but not D.

Thanks.

Assume the answer is C , so one of the districts (C)has population of 10,900. So the biggest possible population of some other district can be 10,900 * 1.1 = 11,990. So how can we have the average of 12000 if the
the district with biggest population has less than that ?

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