SOLUTION: The average of three numbers is 36.The average of two of these numbers is 48.What is the third number. A)19 B)12 C)7 D)10

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Question 1104454: The average of three numbers is 36.The average of two of these numbers is 48.What is the third number.
A)19
B)12
C)7
D)10
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x, the "third" number

highlight_green%28%2848%2B48%2Bx%29%2F3=36%29
Solve for x.
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SOLVE FOR x.
%2896%2Bx%29%2F3=36
96%2Bx=108
x=108-96
highlight%28highlight%28highlight_green%28highlight_green%28x=12%29%29%29%29