find the average of all the numbers between 6 and 38 which are divisible by 4 .
"solution average = ( ( 8 + 12 + 16 + 20 + 24 + 28 + 32 + 36 ) / 8 ) = 186 / 7 = 22 answer b"
divide(add(add(6, const_4), subtract(38, const_4)), const_2)