diff --git a/capactive_mains_inputs/facebook_maths_picture_puzzle.tex b/capactive_mains_inputs/facebook_maths_picture_puzzle.tex new file mode 100644 index 0000000..dcf65d1 --- /dev/null +++ b/capactive_mains_inputs/facebook_maths_picture_puzzle.tex @@ -0,0 +1,40 @@ +\documentclass[a4paper,10pt]{article} +\usepackage[utf8]{inputenc} + +%opening +\title{} +\author{} + +\begin{document} + +\maketitle + +\begin{abstract} + +\end{abstract} + +\section{Various themes but always the same hidden multiply: McDonalds maths puzzle etc.} + +Where $D$ is a drink, $B$ is a burger and $F$ is fries: + +$$ D + D + D = 30 $$ +so $D$ == 10 +$$ D + B + B = 20 $$ +so $B$ == 5 +$$ B + FF + FF = 9 $$ +so $FF + FF = 4$ therefore $FF=2$ so $F=\pm \sqrt{2}$ + +Onto the final equation +$$B + F \times D = \; ? $$ + +As $F$ is $\pm \sqrt{2}$ + +there are two valid answers + +$ 5 + \sqrt{2} \times 10 $ and $ 5 - \sqrt{2} \times 10 $ + +So the answer is either 19.142 or -9.142. + + +\end{document} +