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

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

`(20x+25)/(x+1)` =21

`20x+25 =21 * (x+1)`

`20x+25 =21x+ 21`

`25-21 =21x-20x`

x=4