On the trip

On the trip were more than 55 children, but less than 65 children. Groups of 7 could be formed, but groups of 8 no. How many children were on a trip?

Correct result:

n =  63


n1=7 8=56 n2=7 9=63 55<n1<65 55<n2<65  o1=n1/8=56/8=7 o2=n2/8=63/8=638=778=7.875  n=n2=63

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