Available weights are 500 g and 1kg
The weight to be balanced is 2 kg
1 kg × 2 = 2 kg
500 g × 4 = 2 kg
1 kg × 1 + 500 g × 2 = 2 kg
Thus with a count of two 1 kg weights, four 500 g weights and with a combination of one 1 kg and two 500 g weights, the weight 2 kg can be balanced.