Difference between revisions of "1992 AIME Problems/Problem 3"
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== Solution == | == Solution == | ||
| + | Let <math>\displaystyle n</math> be the number of matches won, so that <math>\displaystyle \frac{n}{2n}=\frac{1}{2}</math>, and <math>\displaystyle \frac{n+3}{2n+4}>\frac{503}{1000}</math>. Cross multiplying, <math>\displaystyle 1000n+3000>1006n+2012</math>, and <math>\displaystyle n<\frac{988}{6}</math>. Thus, the answer is <math>\displaystyle 164</math>. | ||
== See also == | == See also == | ||
* [[1992 AIME Problems]] | * [[1992 AIME Problems]] | ||
Revision as of 18:21, 26 July 2006
Problem
A tennis player computes her win ratio by dividing the number of matches she has won by the total number of matches she has played. At the start of a weekend, her win ratio is exactly 
. During the weekend, she plays four matches, winning three and losing one. At the end of the weekend, her win ratio is greater than 
. What's the largest number of matches she could've won before the weekend began?
Solution
Let 
be the number of matches won, so that 
, and 
. Cross multiplying, 
, and 
. Thus, the answer is 
.
