Aakash was supposed to find the total weight of 20 packets of sweets, not all of which weighted the same. In the process he calculated average of all the possible sets of three packets at a time and found that the average reading that he obtained was 72 kg. Find the sum of the weights of the 20 packets.
Explanation:
We know that average of average of all possible sets of 3 (or any other number) would always be equal to the average of initial numbers.
Hence, over here the average of 20 weights is 72 kg. Hence, their sum = 72 × 20 = 1440 kg.
Hence, option (c).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.