UPSC Civil Services 2022 Prelims General Studies Paper II

Average weight of A,B,C is 40kg .
The average weight of B,D,E is 42kg .
The weight of F is equal to that of B .
Calculation:
(A+B+C)∕3=40
A+B+C=120
(B+D+E)∕3=42
B+D+E=126
As B=F , so we can write F in place of B in equation (2.)
We get, F+D+E=126... (3.)
Adding equation (1.) and (3.), we get
A+B+C+D+E+F=120+126
A+B+C+D+E+F=246
Avereage weight of A, B, C, D, E and F=246∕6=41