A baseball pitcher won 80% of the games he pitched. If he pitched 35 ballgames, how many games did he win?
The whole is 35.
The percent is 80%.
Let n represent the part.
Write a proportion and find the cross products to solve for n.

= 


100n

= 
35 ×80 

100n

= 
2,800 

100n ÷ 100 
= 
2,800 ÷ 100 

n 
= 
28 
28 games.