Question

From 6 to 39 how many number are such which are divisible by 3 or 5

Answer 1

Answer:

16

Explanation:

6,9,10,12,15,18,20,21,24,25,27,30,33,35,36,39

Answer 2

Answer:

16 numbers

Explanation:

In "or" questions we add the two cases.

Key is to find the greatest and smallest number divisible in the given range as well as any intersections.

Divisible by 3:

Greatest = 39

Smallest = 06

Total #divisible = 39/3 - 6/3 + 1 = 13 - 2 + 1 = 12

Divisible by 5:

Greatest = 35

Smallest = 10

Total #divisible = 35/5 - 10/5 + 1 = 7 - 2 + 1 = 6

Divisible by 15(3×5):

Greatest = 30

Smallest = 15

Total #divisible = 30/15 - 15/15 + 1 = 2 - 1 + 1 = 2

Final step:

Answer = 12 + 6 - 2 = 16