# Sunday Times Teaser 2936 – Multicoloured

**by Danny Roth**

**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**?

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This puzzle can easily be solved with the [[ SubstitutedExpression() ]] solver in the

enigma.pyPython library.[ https://repl.it/@jim_r/teaser2936 ]

The final expression is optional, but provides a small decrease in run time.