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x + y = 28, y + z = 22, z + x = 34, find the average of x, y and z.

A30

B16

C20

D14

Answer:

D. 14

Read Explanation:

x + y + y + z + z + x = 28 + 22 + 34 ⇒ 2 (x + y + z) = 84 ⇒ (x + y + z) = 42 The average of x, y and z=42/3=14


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