Question: how many numbers are there between 1 and 100 which are divisible by 5 or 7?
Answer: The total numbers which are divisible by 5 are 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95. So, the total 19 numbers are divisible by 5 between 1 & 100.