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# Percentage problem watch

We need the biggest and smallest chance so:

supposed 100 students

(55+70) - 100 AND (65+80) - 95 ?
2. Draw a Venn diagram, might help with visualising the probelm
3. (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?
4. (Original post by Daniel Atieh)

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.
5. Could this be something to do with upper and lower bounds?
6. 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.
7. 35%
8. The answer is C, but I still feel there's something wrong with my working
9. (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
10. (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.
11. (Original post by Daniel Atieh)
good luck.
Thanks
12. (Original post by raniafern)
Thanks
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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