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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]  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. $$17 \frac{1}{2}$$
[Reveal] Spoiler: OA

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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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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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