Question

The arithmetic mean of x x+3 x+6, x+9 and x+12 is 10 calculate the value of x

Answer 1

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Answer 2

Answer:

The value of x=4

Step-by-step explanation:

Given : The arithmetic mean of x, x+3, x+6, x+9 and x+12 is 10.

To find : The value of x?

Solution : The mean is given by sum of all elements divided by number of elements.

So, The mean of  x, x+3, x+6, x+9 and x+12 is given by,

$\text{Mean}= \frac{\text{Sum of all elemnts}}{\text{Total number of elemnts}}$

Substitute the value in the formula,

$10= \frac{x+x+3+x+6+x+9+x+12}{5}$

$10\times 5= 5x+30$

$50= 5x+30$

$50-30= 5x$

$20= 5x$

$\frac{20}{5}=x$

$x=4$

Therefore, The value of x=4