KöMaL 2018 C1512

We are making 50-gram cubes out of three different mixtures of red, white and green play dough. In the first type of cube, the proportion of the colours is $3:2:0$, in the second type it is $1:3:1$, and in the third type it is $0:1:4$. How many of each type should we make if we want to use $1$ kg of each colour altogether?