Hi Manvi,Basically here first it is given average of 3 chosen nunbers and then the average of all the average of 3 chosen numbers is calculated so each of the number will be equally repeated here in this set. So, 15 is basically the average of these 6 numbers so sum is 6*15 = 90.I hope this helps you, please close the ticket if your query has been resolved.

thank you sir

thank you sir

unable to understand question 30 question 30

unable to understand question 30 question 30