Question

Medal for best answer

Answer 1

b.15

Answer 2

ok ty jojo

Answer 3

I think of proportions but I could be wrong here,
1. add all the colors together to get 20 since you are trying to find black so
\[\frac{ 6 }{ 20 }=\frac{ x }{ 50 }=>300=20x=> x= answer\]