Problem: the average of first six prime numbers which are between 60 and 90 is
Rationale: "explanation : first six prime numbers which are between 60 and 90 = 61 , 67 , 71 , 73 , 79 , 83 average = ( 61 + 67 + 71 + 73 + 79 + 83 ) / 6 = 72.33 answer : e"
annotated_formula: add(60, const_1)