How To Solve Percentages Problems

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What will be the world population in 5 years if we assume that these rates of increase will stay constant for the next 5 years.

In previous lessons, you were shown how to convert a decimal to a percent and a percent to a decimal.

and we found the solution by substituting into a proportion.

But how would we solve this problem: 18 is 40% of what number? Identify: The phrase 18 is means that 18 is the part.

We could have used equivalent fractions instead (i.e., since 20 multiplied by 5 equals 100, we get that 8 multiplied by 5 equals x, so x equals 40).

In Problem 1 we were asked 8 is what percent of 20?

Analysis: In this problem, you are being asked 8 is what percent of 20?

You are given two numbers from the proportion above and asked to find the third.

One of their techniques is to argue for more benefits for "their" group, while claiming that "their" group shouldn't be blamed for the problem.

How can they do this, when they're using the same statistics each time?

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