IX Mathematics Chapter 18 , Sindh Board. New Mathematics Book. Unit 18 - Variations - Class 10 - Sindh Board and Karachi Board. Exercise 18.3 Complete. Lecturer: Shaheer Yousuf Khan Time Stamps: Exercise 18.3 00:29 = Introduction to Ratio 02:04 = Question no.1 09:34 = Question no. 2 21:45 = Question no. 3 29:10 = Question no. 4 #shaheeryk #yksir #esylearning #merit2excel