Find the number and averaged salary of all instructors who are in the department with the highest budget.
return departments ;return budgets of #1 ;return #1 where #2 is  the   highest ;return the   instructors in #3 ;return the   salaries of #4 ;return the   average of #5 ;return #5 ,  #6
['select', 'project', 'comparative', 'project', 'project', 'aggregate', 'union']