Question

18640 is divisible by .

• A. 8
• B. 3
• C. 9

Answer 1

The correct option is A 8

Divisibility of 8 : Last three digit of the number should be divisisble by 8
Divisibility of 9: Sum of all the digits of the number should be a multiple of 9.
Divisibility of 3: Sum of all the digits of the number should be a multiple of 3.

Now,
18640
Divisibility of 8: Last three digits of the number is 640 and it is divisible by 8. So, 18640 is divisible by 8.

Divisibility of 9: 1 + 8 + 6 + 4 + 0 = 19. 19 is not divisible by 9 hence, 18640 is not divisible by 9.

Divisibility of 3; 1 + 8 + 6 + 4 + 0 = 19. 19 is not divisible by 3 hence, 18640 is not divisible by 3.