gee321
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if 3/5 of the people in a theatre buy a snack during interval, and of those who buy a snack 5/7 buy ice cream, what fraction of people in the theatre buy ice cream?
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bluebeetle
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What have you tried so far?

To help you think about what's happening, you might like to make up an amount of people in the theatre (I would recommend 35 as a good number) and then use that number to calculate how many end up buying ice cream. Does that give you a better idea of what's happening?
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theJoyfulGeek
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(Original post by gee321)
if 3/5 of the people in a theatre buy a snack during interval, and of those who buy a snack 5/7 buy ice cream, what fraction of people in the theatre buy ice cream?
2/5 = no snack
3/5 * 5/7 = 3/7 = snack, icecream
3/5 * 2/7 = 6/35 = snack, no icecream

So 3/7 of the people in the theatre buy icecream as a snack, as 5/7 of 3/5 is 3/7.
Last edited by theJoyfulGeek; 5 days ago
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