In a certain set of numbers, the ratio of integers to non-integers is 1:4. What percent of the numbers in the set are integers?
Explanation
When you know that the given parts add up to the whole, then you can turn a part-to-part ratio into two part-to- whole ratios — put each term of the ratio over the sum of the terms. In this case, since all the numbers in the set must be either integers or non-integers, the parts do add up to the whole. The sum of the terms in the ratio 1:4 is 5, so the two part-to-whole ratios are 1:5 and 4:5.
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