In a certain year, the population of a certain town was 9000. If in the next year the population of males increases by 2% and that of the females by 8% and the total population increases to 9600, then what was the ratio of population of males and females in that given year?  Pick:
A) 4 : 5
B) 5 : 4
C) 2 : 7
D) Data inadequate
E) None of these
Let the population of males = x; then the population of females = 9000 – x   Now, 2% of x + 8% of (9000 – x)   = (9600 – 9000 ) = 600   or 0.02x + 720 – 0.08x = 600   or 720 – 600 = 0.08x – 0.02x   or, 120 = 0.06x   x = 2000   Reqd ratio of population of males and females   2000/9000−2000=2000/7000=2:7   Answer 2 : 7
<result>C</result>
In a certain year, the population of a certain town was 9000. If in the next year the population of males increases by 2% and that of the females by 8% and the total population increases to 9600, then what was the ratio of population of males and females in that given year?