Question 1203389
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This wording means that there are 7 equal groups of tourists and 8 equal groups of locals of the same cardinality.


From given data, we find the cardinality momentarily: it is  {{{210/7}}} = 30.


So, each group of tourists contains 30 persons, same as each group of locals consists of 30 persons.


As soon as you know it, you get the  <U>ANSWER</U>  in the next instance: the number of locals is 8*30 = 240.
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Solved.


Good problem for 3rd grade young students, who are just able to divide and to multiply 

integer numbers mentally in their minds.