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# If a basketball team scores an average (arithmetic mean) of x points

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Math Expert
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If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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27 Feb 2014, 06:59
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The Official Guide For GMAT® Quantitative Review, 2ND Edition

If a basketball team scores an average (arithmetic mean) of x points per game for n games and then scores y points in its next game, what is the team's average score for the n+1 games?

(A) $$\frac{(nx + y)}{(n + 1)}$$

(B) $$x + \frac{y}{(n + 1)}$$

(C) $$x + \frac{y}{n}$$

(D) $$\frac{n(x + y)}{(n + 1)}$$

(E) $$\frac{(x + ny)}{(n + 1)}$$

Problem Solving
Question: 116
Category: Arithmetic Statistics
Page: 76
Difficulty: 550

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[Reveal] Spoiler: OA

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Kudos [?]: 128551 [0], given: 12180

Math Expert
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128551 [0], given: 12180

If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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27 Feb 2014, 06:59
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SOLUTION

If a basketball team scores an average (arithmetic mean) of x points per game for n games and then scores y points in its next game, what is the team's average score for the n+1 games?

(A) $$\frac{(nx + y)}{(n + 1)}$$

(B) $$x + \frac{y}{(n + 1)}$$

(C) $$x + \frac{y}{n}$$

(D) $$\frac{n(x + y)}{(n + 1)}$$

(E) $$\frac{(x + ny)}{(n + 1)}$$

Total points for n games = (number of games)*(average number of points) = nx;

Total points for n + 1 games = nx + y;

The average number of points for n +1 games = $$\frac{(total \ points \ for \ n + 1 \ games)}{(number \ of \ games)}= \frac{(nx + y)}{(n + 1)}$$.

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Re: If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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27 Feb 2014, 07:11
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For me is A If you considered X points to n games so you mean will be (X*N)/N and you play another game and score Y points, going in that way will be X*N+Y/N+1 so A it is

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Re: If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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27 Feb 2014, 21:32
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The sum of points for the first n games will be (Average points for n games * no. of games(n)): xn
So, if y points have been added, the total no. of points in (n+1) games will be [xn + y];

Average of n+1 games = [xn + y]/[n+1]

Ans is (A)

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Re: If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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31 May 2017, 19:01
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

If a basketball team scores an average (arithmetic mean) of x points per game for n games and then scores y points in its next game, what is the team's average score for the n+1 games?

(A) (nx + y)/(n + 1)
(B) x + y/(n + 1)
(C) x + y/n
(D) n(x + y)/(n + 1)
(E) (x + ny)/(n + 1)

Problem Solving
Question: 116
Category: Arithmetic Statistics
Page: 76
Difficulty: 550

GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

Average = total/number

x = total/number

Instead of creating a variable t for total, you should use xn.

Then the new score is y, so the new total is xn (prior total) + y (increment)

The new total number is n+1.

(xn+y)/(n+1)

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Re: If a basketball team scores an average (arithmetic mean) of x points [#permalink]

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23 Aug 2017, 19:19
After reading the question, analyze the givens.

Let X = points average current games
Let N = number of current games
Y = points of next game
N + 1 = Number of current games plus the next game

Sum points / Total Games = Average
Average x Total Games = Sum points
Average of current games x total current games + points of next game / total number of games including next game

Therefore,

(X x N) + Y / N + 1

(A)

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Re: If a basketball team scores an average (arithmetic mean) of x points   [#permalink] 23 Aug 2017, 19:19
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