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There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1000 cents. How many 3-cent stamps are there?
There are 130 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 930 cents. How many 6-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 3-cent stamps are there?
There are 190 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
There are 190 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1080 cents. How many 6-cent stamps are there?
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There are 260 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1440 cents. How many 3-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1160 cents. How many 4-cent stamps are there?
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There are 230 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1390 cents. How many 5-cent stamps are there?
There are 140 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 850 cents. How many 5-cent stamps are there?
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