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There are 180 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1260 cents. How many 6-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 2010 cents. How many 7-cent stamps are there?
There are 280 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1830 cents. How many 7-cent stamps are there?
There are 260 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1690 cents. How many 4-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1670 cents. How many 8-cent stamps are there?
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There are 140 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 470 cents. How many 3-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 900 cents. How many 3-cent stamps are there?
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There are 250 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1610 cents. How many 8-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 810 cents. How many 4-cent stamps are there?
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