If one would dissolve 60g of sugar in 300g of water, what would the concentration of sugar in this syrup be?

Density of water = 1000 kg/m^3

1 m^3 = 1000 litres

Therefore,

1000 kg/1000 l = > 1 kg/l = > 1000 g/l

Then, 300 g of water = 300/1000 l = 0.3 l

The concentration of the syrup = mass/amount of water = 60 g/0.3 l = 200 g/l