Brian and Colin win some money and share it in the ratio 5:1. Brian gets £50. How much did Colin get?

Add the the ratio 5:1

It will be 5+1=6

Remember that 6 is the total ratio equivalent to £50 and we only wanted to obtain Collins gain so you say

Collins is represented with the ratio 1 while Brian 5

If 6=£50 what about 1

1*£50/6 which you will give you £8.3