20. When two quantities x and y are in _______ proportion or vary ______ they are written as x ∝ y/1. 20. When two quantities x and y are in _______ proportion or vary ______ they are written as x ∝ y/1. August 5, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related