self Maths Puzzle

A number of children are standing in a circle. They are evenly spaced and the 8th child is directly opposite the 17th child. How many children are there altogether?

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self Other Question

"My grandson is about as many days as my son is weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years?" Each child in a family has at least 4 brothers and 2 sisters. What is the smallest number of children the family might have?