Flashcard 13 - Mathematics Flashcard Set for the Wonderlic Personnel Test

\[\frac{x}{16} = \frac{75}{100}\]

Remember that you put two ratios together with an = sign to create a proportion. Use the information you have and put an x for the information you seek. You don’t know how many of the 16 marbles are red, so the first fraction (ratio) is:

\[\frac{x}{16}\]

What you know is what percentage this is, and that becomes the second fraction (ratio) in the proportion. Any percentage can be expressed as some number over 100, so it would be:

\[\frac{75}{100}\]

Put these two ratios together and you have:

\[\frac{x}{16} = \frac{75}{100}\]

Then, cross multiply to solve for x (the number you need).