Civil Engineering - Water Supply Engineering - Discussion
Discussion Forum : Water Supply Engineering - Section 7 (Q.No. 5)
5.
The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be
Discussion:
16 comments Page 2 of 2.
Pooja said:
5 years ago
Pn = Po + nx + [(n(n+1))/2]*y.
n = no Of decades,
x = avg increase in population,
y = avg. incremental increase,
Po = initial population.
n = no Of decades,
x = avg increase in population,
y = avg. incremental increase,
Po = initial population.
(2)
Anirban Roy said:
5 years ago
Yes, you are right @Pooja. So,
Pn = 55000 + 2 * 7500+(2 * 3÷2) * 750 = 67250.
Pn = 55000 + 2 * 7500+(2 * 3÷2) * 750 = 67250.
(1)
Noini said:
5 years ago
Avg increase is 7500 calculated for 8 decades.
Then the total increase in population from 1930 is 7500x8=60000. If increase itself is 60000, what is the actual population in 1920 initially then? How can the population in 2000 be very less=50000?
Please anyone explain.
Then the total increase in population from 1930 is 7500x8=60000. If increase itself is 60000, what is the actual population in 1920 initially then? How can the population in 2000 be very less=50000?
Please anyone explain.
(2)
Smith said:
5 years ago
Thanks all for eplaining the answer.
(1)
Aakriti pandey said:
3 years ago
What rate of supply would you recommend, for a town with a population of 50,000?
Anyone answer me.
Anyone answer me.
(2)
Thasni Kalam said:
3 years ago
According to Incremental increase method;
P=p+nx+n(n+1)/2*y
P - popln after n decades from the present.
p - present population
x - avg increase of population of known decades
y - avg of incremental increase of the known decades.
Then substitute these values in eqn
Here we want to find the 2020th population calculating from 2000-2020 n=2 decades
P=50000+2*7500+2(2+1)/2*750 = 67250
So, the correct answer is 67250.
P=p+nx+n(n+1)/2*y
P - popln after n decades from the present.
p - present population
x - avg increase of population of known decades
y - avg of incremental increase of the known decades.
Then substitute these values in eqn
Here we want to find the 2020th population calculating from 2000-2020 n=2 decades
P=50000+2*7500+2(2+1)/2*750 = 67250
So, the correct answer is 67250.
(9)
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