Sample Response: The ratio of boys to total students was 25:50. Written as a fraction, this is 25/50. Rewrite the fraction with a denominator of 100 to 50/100. So 50% of the students were boys. Which ideas did you include in your response? Percent represents a part:whole relationship. The ratio expressed in the problem shows a part:part relationship. The ratio of boys to all students is 25:50, which is equivalent to 50:100, so 50% of the students were boys.