Question

If an employee having the weight
of 90kg is added, average weight of company increases by 2kg.
if one having weight 92kg left,
average decreases by 4kg. Find the average.

Need an easy and short cut answer with explanation.​

Answer 1

Step-by-step explanation:

Let the initial average be X  which will be weight of all person divided by total number of person

          X= W/N ....1                 W=weight of all person   N =total number of person

average weight in second case X+2 =W+90/N+1   ....2

average weight in third case      X-4 =W-92/N-1     .....3  

you have three equations and three variables, it can be solved now

hope you got the concept rest simplification can be easily done