Answer:

Step-by-step explanation:
<u>Given:</u>

<u>Substitute:</u>
into 

<u>Swap the sides:</u>
<u />
<u>Divide both sides of the equation by the coefficient of variable:</u>
<u />
<u>Cross out the common factor:</u>
<u />
<u>Find the equation of the function:</u>
<u />
<u>Substitute:</u>
<u />
<u>Calculate the product or quotient:</u>
<u />
Improper Fraction
12/7 = 1 5/7
Answer: The value of x is 3.
Step-by-step explanation:
Since we have given that
10,11, 12 and x
Average of above numbers = 9
As we know that
Average is given by

Hence, the value of x is 3.
2+3+8
3+8+2
3+2+8
8+2+3
8+3+2
there are multiple ways to get the same sum with the same three numbers i hope this helps