Let's define our variables before anything else:
Kas = S
Jaspar = R
Jae = E
$400 is divided between Kas, Jaspar and Jae
This means S + R + E = 400
Kas has twice as much as Jaspar
This means that S = 2R
Jaspar has three times as much as Jae
This means that R = 3E
Because both of our smaller formulas have R, let's replace everything in the first formula with R
S + R + E = 400
plug in values
2R + R + R/3 = 400
multiply everything by 3 to get rid of the denominator
6R + 3R + R = 1200
add
10R = 1200
divide
R = 120
So Jaspar receives $120
