29.3k views
0 votes
Which of the number 285, 627, 5490, 7290, 7295, 15780, 43695 are divisible by 5 but not 3

1 Answer

4 votes

Answer:

Explanation:

They all end in 0 or 5 except 627, so all but 627 are divisible by 5.

The following are divisible by 3

285

627 is divisible by 3 (but not 5)

5490 is divisible by 3

7290 is divisible by 3

15780

43695

===============

So your answer is

7295

I think that's the only one divisible by 5 but not 3.

===============

There's a quick way to divide by 3. Just add the digits. If the sum is divisible by 3 then the whole number is divisible by 3

For example 285

2 + 8 + 5 = 15.

15 is divisible by 3 so 285 is divisible by 3.

==================

7295 = 7 + 2 + 9 +5. Anything adding up to 9 you can cast out.

7 + 2 = 9 Cast it out

9 = 9 Cast it out

5 is not divisible by 3, so 7295 is not divisible by 3

User BoCoKeith
by
6.1k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.