Answer:
The total weight of 1 load of bricks and 3 loads of sticks is 321.25 kg.
Explanation:
Let load of bricks be x
Let load of sticks be y
Load of bricks is twice heavy as load of sticks.
Hence we can say that;

Also given:
The total weight of 4 loads of bricks and 4 loads of sticks is 771 kilograms
Hence;

Now Substituting value of
in above equation we get;

Hence Load of 1 Sticks is 64.25 kg
Now we will substitute value of y in equation
we get;

Hence load of 1 bricks is 128.5 kg
Now we need to find the total weight of 1 load of brick and 3 load of stick
Total weight =

Hence the total weight of 1 load of bricks and 3 loads of sticks is 321.25 kg.