Praxis Math : Understand ratio concepts and use ratio reasoning to solve problems

Study concepts, example questions & explanations for Praxis Math

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Example Questions

Example Question #1 : Number And Quantity

\(\displaystyle 24\) is \(\displaystyle 18\%\) of which of the following numbers?

Possible Answers:

\(\displaystyle 2400\)

\(\displaystyle 120.2\)

\(\displaystyle 133.\bar{3}\)

\(\displaystyle 1800\)

\(\displaystyle 130.\bar{3}\)

Correct answer:

\(\displaystyle 133.\bar{3}\)

Explanation:

In order to solve this problem, we need to understand the relationship between percentages and ratios. Percents can be written as a value over a whole. In this case , our whole is one-hundred percent; therefore, we can write the following:

\(\displaystyle 18\%=\frac{18}{100}\)

Now, we need to create a relationship between our known value and the number we need to calculate. In the problem, we know that \(\displaystyle 24\) is \(\displaystyle 18\%\) of another number we will name, \(\displaystyle x\). Using this information we need to construct a proportion. We can write the following proportion:

\(\displaystyle \frac{24}{x}=\frac{18}{100}\)

We can cross multiply and solve for the unknown variable.

\(\displaystyle \frac{24}{x}\times\frac{18}{100}\)

Rewrite.

\(\displaystyle 24\times100=18\times x\)

Simplify.

\(\displaystyle 2400=18x\)

Divide both sides of the equation by \(\displaystyle 18\).

\(\displaystyle \frac{2400}{18}=\frac{18x}{18}\)

Solve.

\(\displaystyle x=133.\bar{3}\)

 

Example Question #2 : Number And Quantity

\(\displaystyle 30\) is \(\displaystyle 60\%\) of which of the following numbers?

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 50\)

\(\displaystyle 60\)

\(\displaystyle 5\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 50\)

Explanation:

In order to solve this problem, we need to understand the relationship between percentages and ratios. Percents can be written as a value over a whole. In this case , our whole is one-hundred percent; therefore, we can write the following:

\(\displaystyle 60\%=\frac{60}{100}\)

Now, we need to create a relationship between our known value and the number we need to calculate. In the problem, we know that \(\displaystyle 30\) is \(\displaystyle 60\%\) of another number we will name, \(\displaystyle x\). Using this information we need to construct a proportion. We can write the following proportion:

\(\displaystyle \frac{30}{x}=\frac{60}{100}\)

We can cross multiply and solve for the unknown variable.

\(\displaystyle \frac{30}{x}\times\frac{60}{100}\)

Rewrite.

\(\displaystyle 30\times100=60\times x\)

Simplify.

\(\displaystyle 3000=60x\)

Divide both sides of the equation by \(\displaystyle 60\).

\(\displaystyle \frac{3000}{60}=\frac{60x}{60}\)

Solve.

\(\displaystyle x=50\)

Example Question #1 : Understand Ratio Concepts And Use Ratio Reasoning To Solve Problems

Calculate \(\displaystyle 22\%\) of \(\displaystyle 188\).

Possible Answers:

\(\displaystyle 41.31\)

\(\displaystyle 13.64\)

\(\displaystyle 31.46\)

\(\displaystyle 31.36\)

\(\displaystyle 41.36\)

Correct answer:

\(\displaystyle 41.36\)

Explanation:

In order to solve this problem, we need to understand the relationship between percentages and ratios. Percents can be written as a value over a whole. In this case , our whole is one-hundred percent; therefore, we can write the following:

\(\displaystyle 22\%=\frac{22}{100}\)

Now, we need to create a relationship between our known value and the number we need to calculate. In the problem, we know that ore whole number is \(\displaystyle 188\) and we need to calculate \(\displaystyle 22\%\) of this number. We will name this variable, \(\displaystyle x\). Using this information we need to construct a proportion. We can write the following proportion:

\(\displaystyle \frac{x}{188}=\frac{22}{100}\)

We can cross multiply and solve for the unknown variable.

\(\displaystyle \frac{x}{188}\times\frac{22}{100}\)

Rewrite.

\(\displaystyle 100\times x=22\times 188\)

Simplify.

\(\displaystyle 100x=4136\)

Divide both sides of the equation by \(\displaystyle 100\).

\(\displaystyle \frac{4136}{100}=\frac{100x}{100}\)

Solve.

\(\displaystyle x=41.36\)

Example Question #2 : Understand Ratio Concepts And Use Ratio Reasoning To Solve Problems

Calculate \(\displaystyle 20\%\) of \(\displaystyle 300\).

Possible Answers:

\(\displaystyle 600\)

\(\displaystyle 3\)

\(\displaystyle 60\)

\(\displaystyle 6\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 60\)

Explanation:

In order to solve this problem, we need to understand the relationship between percentages and ratios. Percents can be written as a value over a whole. In this case , our whole is one-hundred percent; therefore, we can write the following:

\(\displaystyle 20\%=\frac{20}{100}\)

Now, we need to create a relationship between our known value and the number we need to calculate. In the problem, we know that ore whole number is \(\displaystyle 300\) and we need to calculate \(\displaystyle 20\%\) of this number. We will name this variable, \(\displaystyle x\). Using this information we need to construct a proportion. We can write the following proportion:

\(\displaystyle \frac{x}{300}=\frac{20}{100}\)

We can cross multiply and solve for the unknown variable.

\(\displaystyle \frac{x}{300}\times\frac{20}{100}\)

Rewrite.

\(\displaystyle 100\times x=20\times 300\)

Simplify.

\(\displaystyle 100x=6000\)

Divide both sides of the equation by \(\displaystyle 100\).

\(\displaystyle \frac{6000}{100}=\frac{100x}{100}\)

Solve.

\(\displaystyle x=60\)

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