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There are 250 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1990 cents. How many 7-cent stamps are there?
There are 140 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 910 cents. How many 6-cent stamps are there?
There are 240 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 1080 cents. How many 5-cent stamps are there?
There are 150 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 930 cents. How many 3-cent stamps are there?
There are 250 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1470 cents. How many 3-cent stamps are there?
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There are 220 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 1050 cents. How many 6-cent stamps are there?
There are 250 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 870 cents. How many 3-cent stamps are there?
There are 130 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 890 cents. How many 5-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 710 cents. How many 4-cent stamps are there?
There are 270 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1330 cents. How many 3-cent stamps are there?
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