In a class test , the average mark of Leena and Meena is 80. The average of Meena and Reena is 85 years and the average of Leena and Reena is 90. Find Meena's mark.
There is something I don't understand about algebra: It has been around for thousands of years, yet no one has ever found out what the value of "x" or "y" really is.
Richard van der Merwe
The highest form of pure thought is in mathematics