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parulmahajan89
- Senior | Next Rank: 100 Posts
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Dear parulmahajan89,parulmahajan89 wrote:At a two day seminar, 90 percent of those registered attend the seminar on first day. What percent of those registered did not attend the seminar on either day?
1) Total of 1000 people registered on two day seminar
2) Of those registered, 80 percent did not attend seminar on second day
I'm happy to help with this.
See this blog for info about ratios & proportions:
https://magoosh.com/gmat/2013/gmat-quant ... oportions/
Here's some information about percents:
https://magoosh.com/gmat/2013/gmat-quant ... -percents/
The short answer is: nothing is sufficient here.
The number of people is irrelevant --- all the other information is in percents, and we are asked a prompt question about percent, so the number of the people is completely irrelevant to the calculation.
With all combined information, we know
First day --- 90% attended, so 10% didn't
Second day --- 80% didn't attend, so 20% did.
It could be that the 10% that didn't attend the first day was part of the 80% that didn't attend the second day, so this 10% didn't attend either day.
OR, it could be that everyone in that 10% that didn't attend the first day felt guilty, and were part of the 20% that attended the second day, so that everyone attended at least one day.
Even given all the information, we cannot determine anything definitively. Altogether, everything is still insufficient. Answer = (E).
Does all this make sense?
Mike
