It is currently 20 Jun 2019, 11:25

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

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

Author Message
TAGS:
Founder
Joined: 18 Apr 2015
Posts: 6932
Followers: 114

Kudos [?]: 1344 [0], given: 6333

The average (arithmetic mean) of x and y is 20. If z = 5, wh [#permalink]  08 Jan 2019, 10:12
Expert's post
00:00

Question Stats:

100% (00:23) correct 0% (00:00) wrong based on 6 sessions
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

_________________
Director
Joined: 20 Apr 2016
Posts: 908
WE: Engineering (Energy and Utilities)
Followers: 11

Kudos [?]: 673 [1] , given: 148

Re: The average (arithmetic mean) of x and y is 20. If z = 5, wh [#permalink]  09 Jan 2019, 05:29
1
KUDOS
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 = $$\frac{(40 + 5)}{3}= 15$$
_________________

If you found this post useful, please let me know by pressing the Kudos Button

Rules for Posting https://greprepclub.com/forum/rules-for ... -1083.html

Re: The average (arithmetic mean) of x and y is 20. If z = 5, wh   [#permalink] 09 Jan 2019, 05:29
Display posts from previous: Sort by