Football = 210 people = 42% on graph
210 ÷ 42 = 5
(Football People ÷ Percentage = People per percentage)
1% =5 people
100% = entire chart
100 × 5 people = 500 people
500 people were surveyed
Check work:
500 × .25 = 125 votes for soccer
500 × .33 = 165 votes for baseball
500 × .42 = 210 votes for baseball
= 500 total votes