Tom and Sam had $62 altogether. Sam and Amy had $34 altogether. Tom had three times as much money as Amy.
(a) How much more did Tom have than Amy? (b) How much did Tom have?
t + s = 62 t = 3a results in
3a + s = 62 multiply by -1
-3a -s = - 62
s + a = 34 given now add to the equation above
-2a = -28
a = 14 t = 3a = 42 and s = 20 dollars each