Basic Math Examples

5

$5$ ,

10

$10$ ,

15

$15$ ,

20

$20$

Step 1

The mean of a set of numbers is the sum divided by the number of terms.

\frac{5 + 10 + 15 + 20}{4}

$\frac{5 + 10 + 15 + 20}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Add

5

$5$ and

10

$10$ .

\frac{15 + 15 + 20}{4}

$\frac{15 + 15 + 20}{4}$

Step 2.2

Add

15

$15$ and

15

$15$ .

\frac{30 + 20}{4}

$\frac{30 + 20}{4}$

Step 2.3

Add

30

$30$ and

20

$20$ .

\frac{50}{4}

$\frac{50}{4}$

\frac{50}{4}

$\frac{50}{4}$

Step 3

Cancel the common factor of

50

$50$ and

4

$4$ .

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Step 3.1

Factor

2

$2$ out of

50

$50$ .

\frac{2 (25)}{4}

$\frac{2 (25)}{4}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor

2

$2$ out of

4

$4$ .

\frac{2 \cdot 25}{2 \cdot 2}

$\frac{2 \cdot 25}{2 \cdot 2}$

Step 3.2.2

Cancel the common factor.

$\frac{2 \cdot 25}{2 \cdot 2}$

Step 3.2.3

Rewrite the expression.

$\frac{25}{2}$

Step 4

Divide.

$12.5$