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There are 210 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1670 cents. How many 7-cent stamps are there?
There are 140 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 880 cents. How many 8-cent stamps are there?
There are 200 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 900 cents. How many 5-cent stamps are there?
There are 210 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1540 cents. How many 8-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 720 cents. How many 3-cent stamps are there?
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There are 210 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 950 cents. How many 3-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1500 cents. How many 8-cent stamps are there?
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There are 190 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1190 cents. How many 6-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1020 cents. How many 3-cent stamps are there?
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