find the average of first 6 multiples of 5 ?
"average = ( 5 + 10 + 15 + 20 + 25 + 30 ) / 6 = 17.5 answer is e"
divide(add(add(add(6, const_1), add(add(6, const_1), const_2)), add(subtract(5, 6), subtract(5, const_2))), 6)