Multiple and Factor Challenge

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I am a multiple of 7. I am between 50 and 100. My ones digit is odd. Who could I be? (3 possibilities)

63, 77, 91

I am a multiple of 30. If you round me to the nearest hundred, you get 400. Who could I be? (3 possibilities)

360, 390, 420

I am a multiple of 9 between 50 and 110. I am also a multiple of 6. Who can I be? (4 possibilities)

54, 72, 90, 108

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