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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?

7

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

Answer : 7

If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

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?

In a party of 35 people there are twice as many women as children and twice as many children as men. How many of each are there?