# Maths question

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#1

Not too sure how to do these questions. Does anyone have an easy method to getting to the answer?
Last edited by As.1997; 1 month ago
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1 month ago
#2
(Original post by As.1997)

Not too sure how to do these questions. Does anyone have an easy method to getting to the answer?
A Venn diagram.

Note that your answer (D) is incorrect as there may be some people who like reading AND watching televisions, so you can't just add the two numbers to get 38, as you'd be counting them twice.
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#3
(Original post by ghostwalker)
A Venn diagram.

Note that your answer (D) is incorrect as there may be some people who like reading AND watching televisions, so you can't just add the two numbers to get 38, as you'd be counting them twice.
I was thinking of a Venn diagram but the issue is you don't know if there is any overlap between enjoying reading and watching TV.

I do agree with your explanation about D - (I just randomly guessed because I didn't know how to disprove the options)
Last edited by As.1997; 1 month ago
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1 month ago
#4
(Original post by As.1997)
I was thinking of a Venn diagram but the issue is you don't know if there is any overlap between enjoying reading and watching TV.

I do agree with your explanation about D - (I just randomly guessed because I didn't know how to disprove the options)
When you draw the diagram, you include the overlap, with the understanding that it may be empty.
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#5
(Original post by ghostwalker)
When you draw the diagram, you include the overlap, with the understanding that it may be empty.
I've drawn my Venn diagram as suggested.
Okay, I get it now.
A) The max and min of neither can be achieved by either complete overlap or no overlap hence you get 19 and 10.
B) This is wrong because you could have 29 who like reading and not watching TV i.e. if no overlap occurs.
C) This is just wrong 48-29 vs 48-9
D) We don't know if there is any overlap so we can't conclude this. Suppose if there was a complete overlap then there would be 29 who like neither as opposed to 38.
Last edited by As.1997; 1 month ago
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