Brevet de maths 2017 – subject and answers of the rattrapage in Polynesia

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Part 1
General series
Duration of the test: 2 hours – 50 points

Common theme of the subject of Mathematics, Physics-Chemistry and Life and Earth Sciences
The Sport

Exercise 1: (9 points)
On a spreadsheet, the top ten countries were ranked by
number of medals, at the Rio Olympic Games in 2016.

1. Which of the three formulas proposed was entered in cell F2 of
this spreadsheet, before it is stretched down?

2. We observe the series of gold medals of these ten countries.
a. What is the extent of this series?
b. What is the average of this series?
3. What is the percentage of gold medals won by France in relation to
to its total number of medals? Round the result to the tenth of a percent.
4. The ranking at the Olympic Games is established according to the number of gold medals
obtained and not according to the total number of medals. For this reason, France
with 42 medals is behind Japan which has only 41. By observing
Italy and Australia, establish the ranking rule in case of a tie on the number of
of gold medals.
5. A sports journalist proposes a new procedure for ranking countries:
each gold medal earns 3 points, each silver medal earns 2
points and each bronze medal is worth 1 point. Under these conditions, the
Would France overtake Japan?

Exercise 2: (10 points)
On July 17, 2016, a spectator watches the “Bourg-enBresse / Culoz” stage of the Tour de France.
She notes, every half hour, the distance covered by the French cyclist Thomas VOECKLER who took 4 h 30 min to cover this 160 km stage; she only forgets to note the
distance covered by this one at the end of 1 hour of race.

She gets the following table:

1. How far did he run after 2 hours and 30 minutes?
2. Show that he has covered 30 km in the third hour of the race.
3. Was he faster in the third or fourth hour of
4. Answer the following questions on the APPENDIX page 7 of 7, which is
to be returned with the copy.
a. Place the 9 points of the table in the marker. We can’t place the
point of abscissa 1 since we do not know its ordinate.
b. Using your ruler, connect the consecutive points together.
5. Considering that the speed of the cyclist is constant between two readings,
determine, by graphical reading, the time it took him to travel 75 km.
6. We consider that the speed of the cyclist is constant between the first reading
after 0.5 hours of running, and after 1.5 hours of running
run; determine by graphical reading the distance covered after 1 hour
of the race.
7. Let be the function, which to the time of course of the cyclist Thomas VOECKLER,
associates the distance traveled. Is the function linear?

Exercise 3: (6 points)
The gardener of a soccer club decides to reseed the grass on the field.
game. In order for it to grow properly, he installs a watering system
which is activated in the morning and in the evening, each time, for 15 minutes.
– The watering system consists of 12 independent circuits.
– Each circuit is composed of 4 sprinklers.
– Each sprinkler has a flow rate of 0.4 m3 of water per hour.
How many liters of water will have been consumed if the lawn is watered for the entire
month of July?
Remember that 1 m3 = 1,000 liters and that the month of July has 31 days.

Exercise 4: (7 points)
The figure below shows a cross-section of a gymnasium grandstand. For
to see the game in progress, a spectator in the last row sitting in C should look over the
of the spectator placed in front of him and sitting in D. A part of the ground in front of the
tribune is then hidden from him. We will consider that the average height of a spectator
sitting is 80 cm (CT = DS = 80 cm).


On this cutaway of the grandstand :
– the points R, A and B are horizontally aligned and the points B, C and T are
vertically aligned;
– the points R, S and T are aligned parallel to the inclination (AC) of the stand;
– we will consider that the area represented by the segment [RA] is not visible
by the spectator in the last row;
– the width of the stand is 11 m and the angle of inclination of the
grandstand measures 30°.
1. Show that the height BC of the stand is 6.35 m, rounded to the hundredth
of meter.
2. What is the measure of the angle?
3. Calculate the length RA in centimeters. Round the result to the nearest centimeter.

Exercise 5: (7 points)
The marathon event consists of covering the distance of
42.195 km in running. This distance refers historically to the feat performed
by the Greek PHILLIPIDES, in 490 BC. J-C, to announce the victory of the Greeks against
the Persians. It is the distance between Marathon and Athens.

1. In 2014, the Kenyan Dennis KIMETTO broke the old world record in
covering this distance in 2 h 2 min 57 s. What is then the order of magnitude
of its average speed: 5 km/h, 10 km/h or 20 km/h?
2. During the same race, the British Scott OVERALL took 2 h 15 min
to complete his marathon. Calculate its average speed in km/h. Round up the
value obtained to the hundredth of km/h.
3. In this question, we will consider that Scott OVERALL runs at a speed
constant. As Dennis KIMETTO crossed the finish line, determine :
a. Scott OVERALL’s time left to run;
b. the distance he has to go. Round the result to the nearest meter.

Exercise 6: (6 points)
The figure below is a screenshot of a program made with the software “Scratch”.

scratch patent

1. Show that if we choose 2 as the starting number, then the program returns -5
2. What does the program return if we choose :
a. the number 5 ?
b. the number -4 ?
3. Determine the numbers that must be chosen at the beginning for the program to return 0.


To be detached from the subject and attached with the copy.
Exercise 2 question 4

Answers to the mathematics patent Consult the online answer key

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