Sports Survey: How Many Play All 3 Games?

In summary, a total of 100 students were surveyed about their sports, with 56 playing football, 51 playing cricket, and 55 playing rugby. 24 students played both football and cricket, 21 played both football and rugby, and 28 played both cricket and rugby. It is not specified how many students play all three games, but it is possible for there to be at least one student in this special intersection of all three sets.
  • #1
Firepanda
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100 students are surveyed about their sports. Each play at least 1 of the following sports. football, cricket and rugby. 56 play football, 51 play cricket, 55 play rugby, 24 play football and cricket, 21 play football and rugby, 28 play cricket and rugby. How many play all 3 games?

I tried to do this and I got 0 as my answer. A total of 51 people play cricket, 24 play football & cricket, and 28 play cricket & rugby. 24 + 28 = 52 people play cricket, 52 is greater than 51 which can't be write or the question would be wrong.

Am I misunderstanding the question? I fail miserably when it comes to this area of maths so any help will be appreciated!
 
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  • #2
Firepanda said:
I tried to do this and I got 0 as my answer. A total of 51 people play cricket, 24 play football & cricket, and 28 play cricket & rugby. 24 + 28 = 52, 52 is greater than 51 which can't be write or the question would be wrong.
Since 24 + 28 = 52, that should tell you that there is at least one student who is in both sets ((students who play cricket and rugby) and (students who play cricket and football)). Is it possible for there to be more than one student in this special set (the intersection of these two sets)? Draw a Venn diagram if it helps.
 
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  • #3
Well for another set:

Football & cricket and Football & Rugby -> 24 + 21 = 45 play football, this is less than 56 so this tell us no students are in both sets?

Since no student are in therse sets, then surely none can be in all three?
 
  • #4
Firepanda said:
Well for another set:

Football & cricket and Football & Rugby -> 24 + 21 = 45 play football, this is less than 56 so this tell us no students are in both sets?

Since no student are in therse sets, then surely none can be in all three?

Actually, this tells us that 56 - 45 students play only football. It does not give us any further information about the triple intersection by itself. Draw a Venn diagram of the triple intersection and you should be able to see what you can do.
 
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  • #5
It's at least 0 for the other remaining sets aswell, so is there 1 person playing all 3? :)
 
  • #6
Firepanda said:
It's at least 0 for the other remaining sets aswell, so is there 1 person playing all 3? :)

Not necessarily. All we gathered is that there is at least 1. If you draw a Venn diagram and label what you know, you should be able to get an exact figure from one equation.
 
  • #7
I think there's 7. What did you get?
 
  • #8
I couldn't do it :P I left the answer as at least one, and hoping for some marks!
 
  • #9
when you draw out the diagram, You will see that there are 56+51+55=162 total students playing at least one sport. You subtract off the ones playing two sports, so that's 24+28+21= 79 subtracted from the 162. But in subtracting off the kids with 2 sports, you also subtracted off the kids with three sports, so you have to add them back in...3 times.
If I let F=football, R=rugby and C=cricket (dull, I know), then I get:
F+C+R-FC+FCR-FR+FCR-CR+FCR=100
162-79+3FRC=100
Solve it from there.
Look at the picture to see why it's true. 3 circles, 3 intersections of 2 things and one triple intersection.
CC
 
  • #10
Ah ty!
 

What are the three games included in the sports survey?

The three games included in the sports survey are basketball, football, and soccer.

What is the purpose of the sports survey?

The purpose of the sports survey is to gather data on how many people play all three of the included games.

How is the data collected for the sports survey?

The data for the sports survey is collected through a survey or questionnaire that is given to a sample group of individuals.

What factors may affect the results of the sports survey?

Some factors that may affect the results of the sports survey include the demographics of the sample group, the timing of the survey, and the wording of the questions.

Why is it important to gather data on how many people play all three of the included games?

Gathering data on how many people play all three of the included games can provide insights into the popularity of these sports and potentially inform decisions related to marketing, funding, and other aspects of the sports industry.

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