Question

adda
Q11. The present population of a city is 20,000. The ratio of female to
male is given as 3: 7. If population of female increases by 20% per year
and population of male increases by 40% per year then find the ratio of
male to female after two years in the city ?​

Answer 1

Let the population before two years ago be x

Given the population increases by 10%

So increase in population after one year is

100

10

×x=0.1x

So population after one year is x+0.1x=1.1x

Increase in population after another one year is

100

10

×1.1x=0.11x

So population at present is 1.1x+0.11x=1.21x

But given population at present is 3,02,500

⟹1.21x=302500

⟹x=

1.21

302500

=2,50,000

Population of city two years ago is 2,50,000

Answer 2

Answer:

108:343

Step-by-step explanation:

after all calculation

3*3*18 : 7*7*7

which gives

108:343