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There are 190 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 6-cent stamps and 4-cent stamps. Altogether they cost 1300 cents. How many 6-cent stamps are there?
There are 120 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 620 cents. How many 6-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?
There are 160 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 740 cents. How many 5-cent stamps are there?
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There are 170 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1440 cents. How many 6-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1410 cents. How many 7-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1410 cents. How many 5-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 950 cents. How many 6-cent stamps are there?
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