Answer:
Brother's money = $6
Money I have = $18
Explanation:
Hi, to answer this question we have to write an equation with the information given: 
I have 3 times as much money as my brother: 
Money I have = 3x 
Where x is the money that my brother has: 
Brother's money = x 
Our total is $24 
So, 3x+x =24 
Solving for x 
3x+x=24 
4x =24 
x =24/4 
x = 6 
Replacing with the value of x. 
Brother’s money = x = $6 
Money i have = 3x =3(6) = $18