Answer:
$17.2
Explanation:
The ratio of money in Brian's wallet to Colin's wallet is;
.....(1)
If Brian spent $39, then he now
has: $(B-39)
This amount compared to Collin's money is
$(B-39)=C+4
B=C+4+39
B=C+43.....(2)
Put equation (1) in (2)





Collins initially had $17.2