how many numbers from 9 to 79 are exactly divisible by 11 ?
"9 / 11 = 0 and 79 / 11 = 7 = = > 7 - 0 = 7 numbers answer : b"
add(divide(subtract(multiply(floor(divide(79, 11)), 11), multiply(add(floor(divide(9, 11)), const_1), 11)), 11), const_1)