The two-way table shows the number of people ages 20 and 50 who belong to group a or b.

what percent of people 50 years old belong to group a? express your answer to the nearest whole percent.

%

age 20 age 50
group a 19 32
group b 40 24

If what you mean by the "percent of people 50 years old belong to group A" is the percentage of 50-year old people with respect to the total number of people belonging to group A, then the answer is

32/(19+32) * 100 = 63%

But, if what you mean is the percentage of 50-year old people in group A with respect to the total number of 50-year old people, then the answer will be

32/(32+24) * 100 =  57%

The answers are 20,30,80,180,960,890,1230,4560. on the first row