The Student Room Group

Percentage problem

problem bmat.PNG

How shall I go about this in a quick approach? is my solution correct?

We need the biggest and smallest chance so:

supposed 100 students

(55+70) - 100 AND (65+80) - 95 ?
(edited 7 years ago)
Draw a Venn diagram, might help with visualising the probelm
Original post by an_atheist
Draw a Venn diagram, might help with visualising the probelm

I also thought about it, but couldn't translate it, so I went with the above approach. Can you check my working?
Original post by Daniel Atieh
problem bmat.PNG

How shall I go about this in a quick approach? is my solution correct?

We need the biggest and smallest chance so:

supposed 100 students

(55+70) - 100 AND (65+80) - 95 ?


Seems like the best approach. I noticed it's a BMAT question. I'm doing it this year as well... Just focusing on my UKCAT at the moment.
Could this be something to do with upper and lower bounds?
I get the answer as being E.
I know you didn't use them, but using venn diagrams helped. You label each circle as either the upper or lower limits, then find the population of A and B', then find A' and B. Add these to the 5 that are A' and B', and subtract that from 100.
35%
The answer is C, but I still feel there's something wrong with my working
Original post by an_atheist
I get the answer as being E.
I know you didn't use them, but using venn diagrams helped. You label each circle as either the upper or lower limits, then find the population of A and B', then find A' and B. Add these to the 5 that are A' and B', and subtract that from 100.


thanks, i will look into this method now
Original post by raniafern
Seems like the best approach. I noticed it's a BMAT question. I'm doing it this year as well... Just focusing on my UKCAT at the moment.

good luck.
Original post by Daniel Atieh
good luck.


Thanks :biggrin:
Original post by raniafern
Thanks :biggrin:


No problem. I would suggest you to have a look at another thread I created regarding problem solving and have a go.

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