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Mr. x has taken r test and has average of 80%. What must get

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Mr. x has taken r test and has average of 80%. What must get [#permalink] New post 11 Mar 2008, 07:02
Mr. x has taken r test and has average of 80%. What must get on the next test to acheive an average of 82%?

2r+82
2r+80
r+82
2r-80
2r-82

please explain your answer.
thanks
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Re: Average [#permalink] New post 11 Mar 2008, 07:16
Capthan wrote:
Mr. x has taken r test and has average of 80%. What must get on the next test to acheive an average of 82%?

2r+82
2r+80
r+82
2r-80
2r-82

please explain your answer.
thanks


let x = next test score

(80r + x)/(r+1) = 82

solve for x
Re: Average   [#permalink] 11 Mar 2008, 07:16
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Mr. x has taken r test and has average of 80%. What must get

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