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