word problem: In the playoff game, the ball was carried ....

[lcliff]

Runnig backs. In the playoff game, the ball was carried by either Anderson or Brown on 21 plays. Anderson gained 36 yards, and Brown gained 54 yards. If Brow averaged twice as many yards per carry as Anderson, then how many plays did Anderson carry the ball?

I have no idea how to start.

 

[stapel]

Pick a variable for Anderson's number of carries. Write an expression, in terms of this variable, for Brown's number of carries.

Note that the average yards per carry is the quotient of the total yards carried and the number of carries. Use this fact to create new expressions, in terms of the variable and expression above, for the average yards for each player.

Use these new expressions to create an equation reflecting the fact that Brown's average is twice Anderson's average. Solve the equation.

Eliz.

 

[lcliff]

sorry

sorry for being so difficult but writing the expresion is where i do not know how to start! Is there any more asssistance that you can provide to me?

Thanks

 

[stapel]

Which expression?

Please reply showing how far you have gotten, starting with the variable you picked.

Thank you.

Eliz.

 

[lcliff]

How far??

that is how far I am I guess that is where I need help. To get started...

This is all I have
Yds var. average
Anderson 36 x x
Brown 54 y 2x

I really do not know where to go after this...is any of this right

Thanks

 

[stapel]

Try following the step-by-step instructions provided earlier:

1) Pick a variable for Anderson's number of carries.

2) Write an expression, in terms of this variable, for Brown's number of carries.

3) Note that the average yards per carry is the (hint!) quotient of the total yards carried and the number of carries. Use this fact to create new expressions, in terms of the variable and expression above, for the average yards for each player.

4) Use these new expressions to create an equation reflecting the fact that Brown's average is twice Anderson's average.

5) Solve the equation.

Eliz.

 

[lcliff]

expression

writing the expression is where I need help!!!!!!!! I have no clue how to start.. Any way you can help me write the expression!!! I have no clue how to start.!.!.!

 

[skeeter]

1) Pick a variable for Anderson's number of carries.

let x = number of times Anderson carried the ball

2) Write an expression, in terms of this variable, for Brown's number of carries.

if x = number of times Anderson carried the ball, and if Anderson and Brown carried the ball 21 times together, then Brown carried the ball (21 - x) times

3) Note that the average yards per carry is the (hint!) quotient of the total yards carried and the number of carries. Use this fact to create new expressions, in terms of the variable and expression above, for the average yards for each player.

Anderson's average = 36/x
Brown's average = 54/(21-x)

4) Use these new expressions to create an equation reflecting the fact that Brown's average is twice Anderson's average.

54/(21-x) = 2(36/x)

5) Solve the equation.

can you finish now?