Find two integers A & B, such that:
1. A=3*B
2. Both integers together use only even digits, all of them, each once.
Provide your reasoning.
Pen and paper (at most!) only.
Since there are five even digits: 0,2,4,6,8
A must be a three digit number less than 300, so it begins with 2
to be a multiple of 3, the other digits must be 0,4 or 4,6
if 4,6 then A=246 or 264, B=80. Neither works
if 0,4 then A=204 or 240, B=68 or 86. One of these works
A=204, B=68

Posted by Jer
on 20180115 07:42:21 