<PRE><B>Question 1032769</B>
sarah has some dimes and quarters. If she has 29 coins worth a total of $4.40, how many of each type of coin does she have?
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d + q = 29  (# of coins)
10d + 25q = 440  (value of coins)
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d = 29 - q
Sub for d
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10(29-q) + 25q = 440
290 + 15q = 440
15q = 150
q = 10 quarters
d = 19 dimes</PRE>