calculate the average of all the numbers between 18 and 57 which are divisible by 7 .
"explanation : numbers divisible by 7 are 21,28 , 35,42 , 49,56 , average = ( 21 + 28 + 35 + 42 + 49 + 56 , ) / 6 = 231 / 6 = 38.5 answer : b"
multiply(divide(add(add(floor(divide(18, 7)), const_1), floor(divide(57, 7))), const_2), 7)