Hey there!
A number that is divisible by both 2 and 9 is 18. This is just 2 multiplied by 9. To make this into a 3-digit number, you can just multiply 18 by itself. This will be 324, which is divisible by 9 and 2.
324 ÷ 2 = 162
324 ÷ 9 = 36
So, a number you could choose is 324.
Hope this helped you out! :-)