SOLUTION: john has twice the number of quarters as dimes. the amount of money in$1.80. find the number of dimes

Question 736645: john has twice the number of quarters as dimes. the amount of money in$1.80. find the number of dimes
Found 3 solutions by stanbon, josmiceli, lynnlo:
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
john has twice the number of quarters as dimes. the amount of money in$1.80. find the number of dimes
Equations:
q = 2dan
10d + 25q = 180 cents
-------
Substitute for "q" and solve for "d":
10d + 25(2d) = 180
10d + 50d = 180
60d = 180
d = 3 (# of dimes)
------
Solve for "q":
q = 2d
q = 2*3 = 6 (# of quarters)
============================
Cheers,
Stan H.
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Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
(1) ( in cents )
(2)
--------------
(1)
(2)
Substitute (2) into (1)
(1)
(1)
(1)
(1)
and
(2)
(2)
(2)
There are 3 dimes
check:
(1)
(1)
(1)
OK

Answer by lynnlo(4176)   (Show Source): You can put this solution on YOUR website!
TOTAL===============$1.80
DIMES===========3==.30
QUARTERS========6==$1.50
=========================
===================$1.80
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