L = Money that Leila has
R = Money that Reuben has
S = Money that Scott has
L = S - 5
R = 2S
L + R + S = 63
S - 5 + 2S + S = 63 [ substitute ]
4S - 5 = 63
4S = 68 [ add 5 both sides ]
S = 17
Scott has $17
L = 17 - 5 = 12
Leila has $12
R = 2(17) = 34
Reuben has $34