Answer: a) 3424 b) 2145 c) 10211
Explanation:
First, list out the powers of 5 starting from right to left. Stop when the next power of 5 is greater than 489. (Sorry if that was confusing)
----- ----- ----- -----
125 25 5 1
Then, divide 489 by the powers of 5 starting from the left.
489/125 = 3 r 114
3 would be your first number
Divide the remainder by the next number to the right.
114/25 = 4 r 14
So now, you have 34.
Repeat the process.
14/5 = 2 r 4
Now you have 342.
4/1 = 4
You get 3424.
Repeat these steps for b (with powers of 9) and c (with powers of 3).
Hope this helped! (Sorry, this whole explanation was really confusing)