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We analyze a simple problem into numbers and their properties. USE in mathematics (profile level, No. 19)
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A simple task, on the example of which we will consider standard techniques in non-standard (sometimes) problems. For those who are already familiar with the plot, additional questions are raised in the video.
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Since any two throws in total give no more than 120 points, and 167 is required to score, then throws with a result of less than 47 points are irrelevant. We list all the acceptable throwing options: 48, 51, 54, 57 and 60 points obtained by tripling, as well as getting into the central sector - 50 points. Note that all combinations of triple points give an amount that is divided into three, but 167 is not a multiple of three. So, getting into the bullseye is a must.
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Condition. In the game "Darts" there are 20 outdoor sectors, numbered from 1 to 20 and two central sectors. When entering the outer sector, the player receives the number of points that coincides with the sector number, and for getting into the central sectors he receives 25 or 50 points, respectively. In each of the external sectors there are areas of doubling and tripling, which respectively double or triple the size of the sector. So, for example, getting into sector 10 (not in the doubling and tripling zones) gives 10 points, in the doubling zone of the sector - 20 points, in the tripling zone - 30 points.
a) Can a player score exactly 167 points with three throws?
b) Can a player score exactly 356 points with six throws?
c) With what fewest shots can a player score exactly 1001 points?
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#Exam #Darts