There are five numbers: 18, 36, 54, 72, 90.
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How many numbers less than 700 are divisible by both 15 and 21?
Numbers up to 200 divisible by both 2 and 3 = numbers to 200 divisible by 2*3 = 6 which is int(200/6) = int(33.33) = 33
Divisible by both? 2 numbers... 45 and 90
20 of them.
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.