To simplify the given questions
Part A
[tex]600g\colon4Kg[/tex]
To find the ratio, we will first have to convert the factors into the same units
We will convert 4kg to grams
So that we will have
[tex]\begin{gathered} 1\operatorname{kg}=1000g \\ 4\operatorname{kg}=4000g \end{gathered}[/tex]Therefore
[tex]600g\colon4Kg=600g\colon4000g[/tex]Next, we will have to reduce the ratios to the lowest term
Thus, the answer is
[tex]3\colon20[/tex]Part B
[tex]350\colon400[/tex]Since they have the same units, we will reduce the ratio to its lowest term
Therefore, the answer will be
[tex]7\colon8[/tex]