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2002 maritime mathematics competition (solutions) concours de

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Ajouté le : 21 juillet 2011
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2002 Maritime Mathematics Competition (Solutions) ConcoursdeMathematiquesdesMaritimes2002 (solutions)
1. “We’d better go!It’s ten o’clock,” exclaimed Rachel, looking at her watch. Jonathanlooked at his watch.“Your watch must have stopped some time ago,” he replied.“According to my watch, in 5 minutes, it will be as many minutes short of eleven as it was past ten o’clock 17 minutes ago.” What was the time according to Jonathan’s watch? hh ii Ondevraityaller!Ilestdixheures,secriaRachel.Jonathan hh ii regardasamontre.Tamontresestarreˆtee,jecrois.,repondit-il. Selonlamienne,ilyadix-septminutesiletaitdixheuresetuncertain hh nombre de minutes.Dans cinq minutes, il sera onze heures moins le ii mˆemenombredeminutes. Quelleheureetait-ilselonlamontredeJonathan?
Solution:
Suppose that, according to Jonathan’s watch, the time isxminutes past ten o’clock.Then there are 60xminutes until eleven o’clock so Jonathan’s remark implies that (60x)5 =x17. Thus 2x= 72 soxTherefore, according to Jonathan’s watch,= 36. the time is 10:36. 2. Acertain brand of hockey sticks priced at $50 each was not selling well. When the store manager reduced the price per stick by a whole number of dollars, the whole remaining stock was sold for $2002.What is the least number of items that could have been in stock? Lesbaˆtonsdehockeydunecertainemarquesevendentmala50$la piece.Legerantdumagasinreduitleprixparunnombreentierde dollars et par la suite le stock entier se vend pour 2002 $.Quel est le pluspetitnombredebˆatonsquelestockpouvaitcontenir?
Solution:
Letxbe the reduced price of a hockey stick, and letybe the number of sticks remaining in stock.Nowxandyare positive integers with x <50 andxy= 2002.Expressing 2002 as the product of its prime factors, we obtain 2002 = 2×7×11×13. Sincexy= 2002, the smallest value ofyis attained whenxis as large as possible.Subject
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