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The real numbers x, y and z satisfy the equations x+2y+3z=950 and 3x+2y+z=450 . What is the average of x, y and z ?

 Aug 31, 2021
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Add the two equations together to get

 

4x + 4y + 4z = 1400    divied by 4

x + y  + z = 350        now divide by 3 to get the average of x , y and z............

 Aug 31, 2021

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