how many numbers from 19 to 79 are exactly divisible by 11 ?
"19 / 11 = 1 and 79 / 11 = 7 = = > 7 - 1 = 6 numbers answer : b"
add(divide(subtract(multiply(floor(divide(79, 11)), 11), multiply(add(floor(divide(19, 11)), const_1), 11)), 11), const_1)