Mystery number

A mystery number is between 800 and 920. No digits are the same. The difference of the numbers 5. What is the mystery number?

Correct result:

x1 =  803
x2 =  812
x3 =  821
x4 =  830
x5 =  904
x6 =  913

Solution:

x1=803x_{1}=803
x2=812x_{2}=812
x3=821x_{3}=821
x4=830x_{4}=830
x5=904x_{5}=904
x6=913x_{6}=913

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Dr Math
The difference of the number is 5 - we calculate difference between digits is 5....

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