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Population of Town

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by harsh.champ » Wed Feb 17, 2010 4:05 am
The population of a town doubles every 5 years.If the population at the end of 2000 was 320000,what was it at the beginning of 1961?

(A)1250
(B)80000
(C)12500
(D)12000
(E)16000
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by ajith » Wed Feb 17, 2010 4:26 am
harsh.champ wrote:The population of a town doubles every 5 years.If the population at the end of 2000 was 320000,what was it at the beginning of 1961?

(A)1250
(B)80000
(C)12500
(D)12000
(E)16000
In 40 years population must have grown 2^(40/5) = 2^8 = 256times
Population at the end of 2000 = 320000
Population at the start of 1961 =320000/256 =1250, A
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by shashank.ism » Wed Feb 17, 2010 9:38 am
harsh.champ wrote:The population of a town doubles every 5 years.If the population at the end of 2000 was 320000,what was it at the beginning of 1961?

(A)1250
(B)80000
(C)12500
(D)12000
(E)16000

At the beginning of 1961 means end of 1960 ...
so from end of 1960 to end of 2000 = 40 years
since population doubles every 5 years... so P = 320000/2^(40/5) = 320000/2^8 = 320000/(32x2x2x2) = 10000/8 =1250 Ans A
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by money9111 » Wed Feb 17, 2010 9:49 am
here's another case of Harsh.Champ starting the post and Shashank.ism finishing it... i repeat... very curious...
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by shashank.ism » Wed Feb 17, 2010 9:58 am
money9111 wrote:here's another case of Harsh.Champ starting the post and Shashank.ism finishing it... i repeat... very curious...
I think money1119 is the last one again appraising or commenting whatever as usual, he comes and creates a comment out of anything..its interesting.
though the first time i pointed it out here..
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