<PRE><B>Question 1033249</B>
Tim Whitman has $4.50 in change in his desk drawer to use on the vending ma- chines downstairs. He has four more quarters than dimes. He has three times as many nickels as dimes. How many coins of each type does he have? 
----------
Equations:
q = d + 4
n = 3d
5n + 10d + 25q = 450 cents
-------------------------------------
Substitute to get one variable::
5(3d) + 10d + 25(d+4) = 450
15d + 10d + 25d + 100 = 450
50d = 350
d = 7 # of dimes
n = 3d = 21 # of nickels
q = d+4 = 11 (# of quarters)
-----------------
Cheers,
Stan H.
---------------</PRE>