Let a,b & c be the number of cookies Adrian, Bobby and Calvin baked respectively.
(a+b+c)/3 =138
(a+b)/2 =136
a+b=272
a=272-b
(b+c)/2 =125
b+c=250
c=250-b
Sub a=272-b and c=250-b into (a+b+c)/3 =138,
(a+b+c)/3 =138
[(272-b)+b+(250-b)]/3 = 138
272-b+b+250-b = 414
-b = -108
b=108
From the above,
a=272-b
=272-108
a=164
c=250-b
=250-108
c=142
∵ a=164
b=108
c=142
∴ Adrian baked 164 cookies.
Bobby baked 108 cookies.
Calvin baked 142 cookies.
Mean is an average.
In order to find mean we must add up all the numbers and divide by how many numbers there are.
82 + 105 + 247 + 119 + 94 + 202
Adding them together and we get...
849.
We can see that we have 6 numbers.
849/6
849 divided by 6 is...
141.5
That is the mean.
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(8x-9) + 3x = 90
8x + 3x -9 = 90
11x = 99
x = 99/11 = 9
3x = 3(9) = 27
8x-9 = 90 -27 = 63
