how many numbers from 49 to 79 are exactly divisible by 11 ?
"49 / 11 = 4 and 79 / 11 = 7 = = > 7 - 4 = 3 numbers answer : d"
add(divide(subtract(multiply(floor(divide(79, 11)), 11), multiply(add(floor(divide(49, 11)), const_1), 11)), 11), const_1)