The two-way table shows the number of men and women who voted for candidate a or b.
what percent of people who voted for candidate a were women? express your answer to the nearest whole percent.
%
men women
candidate a 1253 1921
candidate b 1564 1723

We're looking for a percentage of the people who voted for Candidate-A.  So
the first thing we need to know is:  How many people voted for Candidate-A ?

The number of people who voted for Candidate-A is

                      (1,253 men) + (1,921 women)  =  3,174 people .

The question is:  What percent of those people were women ?

Out of the total, 1,921 were women. 
To find percent, you divide the part by the total.

                   1,921 / 3,174  =  0.6052 .

Changed to percent and rounded to the nearest whole one, that's  61% .