Given Data:
The weight of the first bag is 2/7.
The weight of the second bag is 7/10.
The weight of the third bag is 3/5.
[tex]\text{The total weight =}\frac{2}{7}+\frac{7}{10}+\frac{3}{5}=\frac{(2\times10)+(7\times7)+(3\times14)}{70}=\frac{20+49+42}{70}=\frac{111}{70}=1\frac{41}{70}[/tex]Thus, the total weight of the 3 bags is
[tex]1\frac{41}{70}[/tex]