[Solved] If the average (arithmetic mean) of x, y, and z is…

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virat

2 months ago

If the average (arithmetic mean) of x, y, and z is 7x and x ≠ 0, what is the ratio of x to the sum of y and z?
(A) 1:21
(B) 1:20
(C) 1:6
(D) 6:1
(E) 20:1

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