What is the respective ratio of men living in society E in the year 2006 to the year 2007 ?

Number of men in society E in 2006

$=55 \%$ of $340=frac{55 imes 340}{100}=187$

Number of men in society E in 2007

$=60 \%$ of $330=frac{60 imes 330}{100}=198$

$herefore$ Required ratio $=187: 198$

$=17: 18$