Difference between revisions of "2007 AMC 10B Problems/Problem 6"
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Revision as of 17:31, 27 May 2011
Problem 6
The will be scored by awarding points for each correct response, points for each incorrect response, and points for each problem left unanswered. After looking over the problems, Sarah has decided to attempt the first and leave only the last unanswered. How many of the first problems must she solve correctly in order to score at least points?
Solution
Sarah is leaving questions unanswered, guaranteeing her points. She will either get points or points for the rest of the questions. Let be the number of questions Sarah answers correctly. The number of questions she answers correctly has to be a whole number, so round up to get