From New Scientist #3440, 27th May 2023 [link] [link]
“Not one of your best, is it?”, smirked Michael, peering over Leo’s shoulder at the portrait he was painting. “The colours are so drab. Who is she?”
“The name’s Lisa”, said the model, smiling enigmatically from the other side of the easel.
“I’m trying to mix a glaze to perfect the tone of her face”, sighed Leo. “But I seem to have run out of paint”.
“Yes, about that”, said Michael. “I might have borrowed some for a ceiling. In any case, it looks like you’ve got two brownish dollops there”.
“One of them is equal parts yellow, red and blue. The other is five parts yellow, three parts red and four parts blue. But anyone can see her cheeks require 10 parts yellow, eight parts red and nine parts blue!” said Leo.
Lisa sat and listened quietly, with a knowing look in her eye. Or maybe sad, or bored; it is hard to say. But if Leo is to finish his portrait, in what proportions should the two dollops be mixed to produce the right tone?
This puzzle sees the name of the series switch from Puzzle to Headscratcher. Probably related to the book Headscratchers due to be published in October 2023 [link].