how many numbers from 39 to 79 are exactly divisible by 11 ?
39 / 11 = 1 and 79 / 11 = 7 = = > 7 - 3 = 4 numbers answer : c
add(divide(subtract(multiply(floor(divide(79, 11)), 11), multiply(add(floor(divide(39, 11)), const_1), 11)), 11), const_1)