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There are 230 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1310 cents. How many 7-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1350 cents. How many 7-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 960 cents. How many 5-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 3-cent stamps are there?
There are 140 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1100 cents. How many 7-cent stamps are there?
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There are 230 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 1080 cents. How many 6-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1450 cents. How many 7-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 830 cents. How many 7-cent stamps are there?
There are 200 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1520 cents. How many 5-cent stamps are there?
There are 200 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 840 cents. How many 3-cent stamps are there?
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