the average of first 3 prime numbers greater than 20 is ?
23 + 29 + 31 = 83 / 3 = 27.7 answer : d
divide(add(add(add(20, const_3), add(add(add(20, const_3), const_4), const_2)), add(add(add(add(20, const_3), const_4), const_2), const_2)), 3)