Solution for yesterday’s problem
If initial quantity of liquids in the two barrels are same and you transfer certain quantity from barrel 1 to 2 and again you transfer the same quantity from barrel 2 to 1 then the ratio of percentage of second liquid to first liquid in barrel 1 to the percentage of first liquid to second liquid in barres 2 will always be 1:1.
The average weight of 45 students in a class is 52 kg. 5 students whose average is 48 kg leave the class and 5 students whose average is 54 kg join the class. What is the new average?