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There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
Any number whose last digit is 0 would be divisible by both these numbers. 1000, 1010, 1020...
7777
All 4 digit numbers that are divisible by 9 are also divisible by 3. The first is 1008 and the last is 9999.
2999 of them.