The answer is 3/4. All you need to do is make proportion and simplify! Hope it helps!
this can be solve by 3 variable equation
let x be the money of luke
y money of rachel
z money of daniel
first equation
x = y + 21
second equation
x = z + 48
third equation
x + y + z = 168
solving simultaneously
x =79
y = 58
z = 31
<span> </span>
Please show a pic so i can understand better
Apperently someone deleted my question i was trying to see if you had understood what i was trying to help you on