Question 836382
Q:
If the average of x,y,z and 60 is 75, then the average of (x-17) , (y+30) and (z-13) is
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A:
{{{(x + y + z + 60)/4 = 75}}} -->  x + y + z = 240

{{{((x-17) + (y + 30) + (z - 13))/3}}} = {{{(x + y + z)/3 + (-17 + 30 - 13)/3}}}
= {{{240/3 + 0}}}
={{{highlight(80)}}}