SOLUTION: Meera purchases a number of 30 cents and 50 cents stamps for $7.60. If she bought 20 stamps altogether how many of each does she have?

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Question 647565: Meera purchases a number of 30 cents and 50 cents stamps for $7.60. If she bought 20 stamps altogether how many of each does she have?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of 30 cent stamps she bought
+20+-+x+ = number of 50 cent stamps she bought
given:
+.3x+%2B+.5%2A%28+20+-+x+%29+=+7.6+
+.3x+%2B+10+-+.5x+=+7.6+
+-.2x+=+-2.4+
+.2x+=+2.4+
+x+=+12+
+20+-+x+=+8+
She has twelve 30 cent stamps and eight 50 cent stamps