Basic Math Examples

$19$ , $20$ , $21$ , $22$ , $23$ , $24$ , $25$ , $26$ , $27$ , $28$ , $29$ , $30$

Step 1

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

$\frac{19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2

Simplify the numerator.

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Step 2.1

Add $19$ and $20$ .

$\frac{39 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.2

Add $39$ and $21$ .

$\frac{60 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.3

Add $60$ and $22$ .

$\frac{82 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.4

Add $82$ and $23$ .

$\frac{105 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.5

Add $105$ and $24$ .

$\frac{129 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.6

Add $129$ and $25$ .

$\frac{154 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.7

Add $154$ and $26$ .

$\frac{180 + 27 + 28 + 29 + 30}{12}$

Step 2.8

Add $180$ and $27$ .

$\frac{207 + 28 + 29 + 30}{12}$

Step 2.9

Add $207$ and $28$ .

$\frac{235 + 29 + 30}{12}$

Step 2.10

Add $235$ and $29$ .

$\frac{264 + 30}{12}$

Step 2.11

Add $264$ and $30$ .

$\frac{294}{12}$

Step 3

Cancel the common factor of $294$ and $12$ .

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Step 3.1

Factor $6$ out of $294$ .

$\frac{6 (49)}{12}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor $6$ out of $12$ .

$\frac{6 \cdot 49}{6 \cdot 2}$

Step 3.2.2

Cancel the common factor.

$\frac{6 \cdot 49}{6 \cdot 2}$

Step 3.2.3

Rewrite the expression.

$\frac{49}{2}$

Step 4

Divide.

$24.5$