The lowest common multiple of 8, 9 and 12 is 72 and so the answer will the first multiple of 72 that contains 5 digits.
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It could be: 72,000
If that's 89 and 12, the answer is 10680 If that's 8, 9 and 12, the answer is 10008
144 is divisible by 12 and 9.
12
12