Question

16. 10% of Mexico's population migrated to South Asia,
10% of the remaining migrated to America and 10%
of the rest migrated to Australia. If the female
popu-
lation, which was left in Mexico, remained only
3,64,500, find the population of Mexico City before
the migration and its effects if it is given that before
the migration the female population was half the
male population and this ratio did not change after
the migration?
(a) 10,00,000
(b) 12,00,000
(C) 15,00,000
(d) 16,00,000
hoc​

Answer 1

Answer:

120000, 0000 its a answer

Answer 2

Answer:

1500000

Step-by-step explanation:

Let the population of Mexico be x

Pop. after 10% migrated to SA = 1-0.1= 0.9x

Population after 10% migrated to America = 0.9x * 0.9 = 0.81x

Population after 10% of the rest migrated to Australia = 0.81x * 0.9 = 0.729x

Let the no of males be a and females be b

=> a+b = 0.729x

Given that b=a/2

ratio didn't change after and before migration so, b = 364500

=> a = 2*364500 = 729000

=> 729000 + 364500 = 0.729x

=> x = 1500000