Question

What is the greatest 3-digit number divisible by 3 but not by 9?​

Answer 1

Answer:

I think it would be 996

Step-by-step explanation:

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Answer 2

Answer:

Let's express 9 and 21 as factors of prime numbers:

9=3*3

21=3*7

The 3-digit number must be divided by 9*7=63

The highest number of 3 digits is 999.

The requested number is below 999 since this number can be divided by 9 not by 21. This number must be a multiple of 63:

We start trying with 882 since is a multiple of 63 and close to 999.

Next: 882+63=945

Next:945+63=1008 (this is 4-digit number).

Therefore, the number is 945