SOLUTION: Carly has 13 coins worth $0.94. If the coins are all dimes and pennies, how many dimes and pennies does she have?

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Question 980065: Carly has 13 coins worth $0.94. If the coins are all dimes and pennies, how many dimes and pennies does she have?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +p+%7D%7D%5D+=+number+of+pennies%0D%0ALet+%7B%7B%7B+d+ = number of dimes
-----------------------------
(1) +p+%2B+d+=+13+
(2) +p+%2B+10d+=+94+ ( in cents )
----------------------------
Subtract (1) from (2)
(2) +p+%2B+10d+=+94+
(1) +-p+-+d+=+-13+
---------------------
+9d+=+81+
+d+=+9+
and
(1) +p+%2B+d+=+13+
(1) +p+%2B+9+=+13+
(1) +p+=+4+
--------------------
She has 4 pennies and 9 dimes
check:
(2) +p+%2B+10d+=+94+
(2) +4+%2B+10%2A9+=+94+
(2) +4+%2B+90+=+94+
+94+=+94+
OK