[ \frac{30}{x - y} + \frac{44}{x + y} = 10 ] [ \frac{40}{x - y} + \frac{55}{x + y} = 13 ]

He let ( a = \frac{1}{x-y} ) and ( b = \frac{1}{x+y} ). Then: [ 30a + 44b = 10 ] [ 40a + 55b = 13 ]

Here it is: The Tattered Blue Book

Only then did he open the PDF. He scrolled to Chapter 4, Problem 37(c). The solution matched exactly. But at the bottom, in the faded scan of Pillai’s original text, was a handwritten note from some unknown student decades ago:

Arul had downloaded the solutions PDF on his phone—"Pillai Solutions," as everyone called it—but he hadn't opened it. Not yet. His math teacher had given him a warning: "Arul, if you look at the answers before struggling, you will learn nothing. Pillai expects you to weep over a problem before you understand its beauty."