Jason, Edward and Sam had a total of $837. Jason had the least amount of money. The ratio of Edward's money to Sam's money was 4:3 at first. Jason and Edward each spent 1/3 of their money. Given that the three boys had $648 left, how much did Jason have at first?
x = jason , y = edward, z = sam
x + y + z = 837
x < y, z
y : z = 4 : 3
(2/3)x + (2/3)y + z = 648.
2x + 2y + 3z = 1944
x + y + (3/2)z = 972
0.5z = 153, so z = 306
y = 408
so x = 123
, 0.5z is supposed to equal to 135, so z = 270. so y = 360, so x = 
