Question 1067688
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Instead of doing your homework for you, I'll do one 
exactly like it with different numbers.
You can use it as a step-by-step guide:

The exactly similar problem is:
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In a set of eleven numbers, the average of the first six is 9 and 
the average of the last five is 20. what is the average of all 
eleven numbers?

in a set of eleven numbers,
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Let the numbers be a, b, c, d, e, f, g, h, i, j, k
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the average of the first 6 is 9 
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So

{{{(a+b+c+d+e+f)/6=9}}}

and therefore

a+b+c+d+e+f = 54
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and the average of the last 5 is 20. 
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{{{(g+h+i+j+k)/5=20}}}

and therefore

g+h+i+j+k = 100
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what is the average of all eleven numbers
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{{{(a+b+c+d+e+f+g+h+i+j+k)/11=((a+b+c+d+e+f)+(g+h+i+j+k))/11=(54+100)/11=154/11=14}}}

Answer = 14

Now you do yours exactly step-by-step the same way.

Edwin</pre><b>