math

Mrs. Rossi wrote the following clues for a mystery number. It is a 4-digit number. The tens are double the ones. The thousands are double the tens. The sum of the digits is 19.

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  1. let the hundreds be X

    so the only possible cases are

    4X21 and 8X42

    to have a sum of 19 X can only be 5

    (it would have to be 12 for the first case, not possible)

    The number is 8542

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  2. 4321
    1234
    1533
    1234567890

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  3. Mrs rossi wrote the following clue first a mystery number
    It is a 3-digit number the tens are double the ones the hundreds are double the tens
    The sum of the digital is 14 what is the number

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