SOLUTION: Bobbi has nine stamps, some of which are 32-cent stamps and some of which are 23-cent stamps. The total value of all the stamps is $2.52 , how many of her stamps are worth 32-cents

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Question 743624: Bobbi has nine stamps, some of which are 32-cent stamps and some of which are 23-cent stamps. The total value of all the stamps is $2.52 , how many of her stamps are worth 32-cents
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of +23+ cent stamps
+9+-+x+ = number of +32+ cent stamps
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+23x+%2B+32%2A%28+9+-+x+%29+=+252+ ( in cents )
+23x+%2B+288+-+32x+=+252+
+-9x+=+252+-+288+
+-9x+=+-36+
+x+=+4+
+9+-+x+=+5+
5 of her stamps are worth 32 cents
check answer:
+23x+%2B+32%2A%28+9+-+x+%29+=+252+
+23%2A4+%2B+32%2A%28+9+-+4+%29+=+252+
+92+%2B+32%2A5+=+252+
+92+%2B+160+=+252+
+252+=+252+
OK