Question

Find the number of positive integers not exceeding 100 that are divisible by 5 or by 7 .

Answer 1

there are 32 numbers. they are 5,7,10,14,15,20,21,25,28,30,35,40,42,45,48,50,55,56,60,63,65,70,75,77,80,84,85,90,91,95,98,100