Question 528157
Let m be the number of men in the population, and w be the number of women in the population.
The number of married men, equalling the number of married women is
{{{(4/10)m=(3/10)w}}}
That means that
{{{m=(3/10)(10/4)w=(3/4)w}}}
So the total of the population is
{{{m+w=w+(3/4)w=(7/4)w}}}
The number of married people is twice the number of married women or
{{{2(3/10)w=(6/10)w}}}
And the fraction of the population that is married is
{{{(6/10)w/((7/4)w)=(6/10)(4/7)=24/70}}}
That's 34%, or 34.3%, or 34.29%, or ...
Maybe there were just 70 people in that town, 40 women and 30 men, including 12 couples.