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The average (arithmetic mean) of x and y is 20. If z = 5, wh

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The average (arithmetic mean) of x and y is 20. If z = 5, wh [#permalink] New post 08 Jan 2019, 10:12
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The average (arithmetic mean) of x and y is 20. If z = 5, what is the average of x, y, and z?

A. \(8 \frac{1}{3}\)

B. \(10\)

C. \(12 \frac{1}{2}\)

D. \(15\)

E. \(17 \frac{1}{2}\)
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Re: The average (arithmetic mean) of x and y is 20. If z = 5, wh [#permalink] New post 09 Jan 2019, 05:29
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Carcass wrote:
The average (arithmetic mean) of x and y is 20. If z = 5, what is the average of x, y, and z?

A. \(8 \frac{1}{3}\)

B. \(10\)

C. \(12 \frac{1}{2}\)

D. \(15\)

E. \(17 \frac{1}{2}\)


Arithmetic mean of x and y = 20

i.e\(x + y = 20 * 2 = 40\)

Now the mean of x,y and z = \(\frac{(40 + 5)}{3}= 15\)
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Re: The average (arithmetic mean) of x and y is 20. If z = 5, wh   [#permalink] 09 Jan 2019, 05:29
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