SOLUTION: An office has some .20 stamps and some .28 stamps. All together the office has 140 stamps for a total value of $31.20. How many of each type of stamp does the office have? Using on

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Question 291667: An office has some .20 stamps and some .28 stamps. All together the office has 140 stamps for a total value of $31.20. How many of each type of stamp does the office have? Using only x
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.2*x+.28(140-x)=31.20
100 20 centers and 40 28 centers