math

it is a 3 digit number
all the digits are different
the first and second digits are multiple of 3
the first digit is greater than the second digit.

the sum of the first two digits is 7 more that the third digit
the number is not a multiple of 5 the third digit is greater than 3

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  1. let the number have the form abc

    "the first and second digits are multiple of 3
    the first digit is greater than the second digit."
    ---> has to be 63c or 963, would also consider 30c

    "the sum of the first two digits is 7 more that the third digit "
    --> a+b-7 = c , which rules out the case 30c
    for 63c , c = 2, but the third digit has to greater than 3

    for 96c , c = 8

    so the number is 968

    check:
    is it a 3 digit number? yes
    are all the digits different? yes
    are the 1st and 2nd multiples of 3? yes
    is the first > the 2nd ? yes
    is the sum of the first and second 7 more than the third? yes
    the number is NOT a multiple of 5 ? yes
    the third digit > 3 ? yes

    Note the hint about multiples of 5 was not needed.

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  2. Which one is first number from left or right

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