# All attendees to a party shakes with each other and 21 handshakes are made. How many people are attending the party?

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All attendees to a party are introduced to one another. 21 handshakes are made in total. How many people are attending the party?

posted Sep 16, 2014
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## 2 Answers

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7

Formula n*(n-1)/2 = 21

answer Sep 16, 2014
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Answer : 7

Formula n*(n-1)/2 = 21

answer Feb 26, 2016

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Initially, 60% of all attendees in a school party were girls. A while later, with 8 girls and 12 boys gone, the number of girls became twice as many as the number of boys.
How many people were present initially?