Question 402556
"Write a proportion for the problem & solve: Mr.Bentley has 25 students. The ratio of boys to girls is 3:2. How many boys does he have in his math class?"



25 total students


ratio of boys to girls
= 3:2


That means the ratio of boys to total is 3:5


3 boys/5 total = x boys/25 total {this is the proportion}
5x = 3(25) {cross-multiplied}
5x = 75 {multiplied 3 by 25} 
x = 15 boys {divided both sides by 5}
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