self Maths Puzzle

A group of children stand holding hands in a large circle and a teacher walks around a circle giving each child in order a number 1,2,3,4,5,6,7,8...... so on.. If number 12 standing opposite number 30. How many children are there in the circle.

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self Other Question

76^345*23^245=??
find the last digit?
A,B and C were the three representatives for their school in a cross country race. A finished the race in middle position, B finished after A, in 19th position, and C finished 28th. How many school took part in the race?