SOLUTION: How do you solve "mark has twice as many quarters as nickels and three more dimes than nickels. he has $4.20 in all. how many of each does he have? in system of equations form

Question 681003: How do you solve "mark has twice as many quarters as nickels and three more dimes than nickels. he has $4.20 in all. how many of each does he have? in system of equations form

Found 2 solutions by funmath, josmiceli:
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of quarters he has
Let = number of dimes he has
Let = number of nickels he has
---------------------------------
given:
(1)
(2)
(3) ( in cents )
---------------------------
Substitute (1) and (2) into (3)
(3)
(3)
(3)
(3)
and
(1)
(1)
(1)
and
(2)
(2)
(2)
Mark has 12 quarters, 9 dimes, and 6 nickels
check:
(3)
(3)
(3)
(3)
OK

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