The correct option is D 700 g
From the given weight balance, it is clear that there are two objects weighing 500 g and 1.2 kg respectively.
To balance the scales, the weight on both sides should be the same.
We can see that the weight on the left side scale is 500 g, and the weight on the right side scale is 1.2 kg.
{Since I kg = 1000 g }
=> We can convert 1.2 kg = 1.2 × 1000 = 1200 g
To balance, we have to add some weight on the left side.
Extra weight required to balance = 1200 – 500 = 700 g
Hence, the weight required to balance the system is 700 g.