Study Barn - If 6y - 4z = 47 and y + 11z = 2, what is the average (arithmetic mean) of y and z?

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If 6y - 4z = 47 and y + 11z = 2, what is the average (arithmetic mean) of y and z?

A. 3.5

B. 4.5

C. 5

D. 7

E. 9

Adding the equations gives 7y + 7z = 49.
Dividing by 7 gives y + z = 7.
So, Arithmetic Mean = (y + z)/2 = 7/2 = 3.5.

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Taken: 19 times

Added: 11/12/2008

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Taggged: Math, SAT

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