Question

if r equals 35 and s equals to 5t t=2u and u≠0 what is the value of rst/u³
2. before last nights game a basketball player has scored an average ( arithmetic mean) of 20 points per game . she scored 25 points in last nights game raising her average go 21 points per game. how many games did she play before last night's game
@3 (b)4(c)5(d)6(e)7
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Answer 1

Question:

before last nights game a basketball player has scored an average ( arithmetic mean) of 20 points per game . she scored 25 points in last nights game raising her average go 21 points per game. how many games did she play before last night's game

Answer:

She played 4 games before last night's game

Step-by-step explanation:

Given:

Average of last night basketball games = 20

Points scored in last night game =  25

Rise in average after last night game =  21

To Find:

The number  of games played last night = ?

Solution:

Let the number of games played before last night's game be x

Then

The average of x games =20

That is

$\frac{\text{ Total points scored in x games}}{x}= 20$

Total  points scored in x games = 20x

In last night game she scored 25 points

So now the total score will be  = 20x+25 and

the number of games will be x+1

Now the

The average of x+1 games = 21

$\frac{20x+25}{x+1}$ =21

$20x+25 =21 \times (x+1)$

$20x+25 =21x+ 21$

$25-21 =21x-20x$

x=4