aminah thinks of a 4-digit number. what is the number?

every digit is different.
the sum of the thousands digit and the tens digit is 10.
the sum of all the digits is 16.
the difference between the hundreds digit and the ones digit is 6.
the difference between the thousands digit and the hundreds digit is 3.
the number is greater than 8000

1 answer

The digits are a b c d
a = 8 or 9
a+c = 10
a+b+c+d = 16
now provide the other two equations and solve things.
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