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Ratios, proportions, and percents
Percent of a number: word problems

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.

 $\frac{n}{35}$ = $\frac{80}{100}$ 100n = 35 ×80 100n = 2,800 100n ÷ 100 = 2,800 ÷ 100 n = 28

 80% of 35 is 28.

28 games.

I have 20 bags of sweets. My brother eats 30% of them. How many do I have left?