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If a number is divisible by the primes 2, 3, and 5, it is divisible by their product which is 30. So your number must be 30 times something.

30*1 = 30

30*2 = 60

................

30*6 = 180

30*7 = 210

30*8 = 240

30*9 = 270

30*10 = 300

The answers are 210, 240, and 270

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13y ago

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