At a theme park, it costs for entrance :-
7  pounds  for an adult and 4 pounds  for a child.

The car park costs 3  pounds  for a car.

The car park costs 5  pounds  for a minibus.

The car park costs 8  pounds  for a coach.

A group of 3 adults and some children went in a minibus.

It cost them   58 pounds to park and go inside.

How many children were there?

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