I have a problem on "Violympic Toan Tieng Anh" round 3. I want everybody help me.

This is the problem: Find the number , 0 is a unit digit and $68 < a

Thanks for help !

I have a problem on "Violympic Toan Tieng Anh" round 3. I want everybody help me.

This is the problem: Find the number \(a\), 0 is a unit digit and $68 < a

Thanks for help !