Sunday Times Teaser 2936 – Multicoloured
by Danny Roth
Published December 30 2018 (link)
George and Martha are selling wall-paper of various colours. By replacing letters with positive digits, they have devised the following multiplication problem:
RED x GREY == YELLOW
The N in GREEN is the remaining positive digit. The red wall-paper is sold only in squares, which is appropriate since RED is a perfect square.
What is the value of GREEN?