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

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Math Expert
Joined: 02 Sep 2009
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The average (arithmetic mean) of x and y is 20. If z = 5, what is the  [#permalink]

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08 Jan 2019, 23:54
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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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Joined: 28 Aug 2018
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Re: The average (arithmetic mean) of x and y is 20. If z = 5, what is the  [#permalink]

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09 Jan 2019, 00:01
Imo D

X+y=20×2=40
Z=5
X+y+z=45
Mean of 45/3=15

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Re: The average (arithmetic mean) of x and y is 20. If z = 5, what is the  [#permalink]

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09 Jan 2019, 02:09
Bunuel 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. $$17 \frac{1}{2}$$

x+y=40
40+5/3 = 15
IMO D
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Re: The average (arithmetic mean) of x and y is 20. If z = 5, what is the   [#permalink] 09 Jan 2019, 02:09
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