MATHEMATICS · Single correct · AoPS · Mathematics · Multi-Variable Linear Equations · Multi-Variable Linear Equations
Problem
Rina purchases 4 notebooks and 6 pens for ₹170. Amit purchases 6 notebooks and 4 pens for ₹180. (Ignore Rina's separate payment of ₹30 for a file.) Assuming every notebook costs ₹n and every pen costs ₹p, find the price of one notebook.
(a) ₹18
(b) ₹22
(c) ₹15
(d) ₹20