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There are 180 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 780 cents. How many 3-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 900 cents. How many 6-cent stamps are there?
There are 260 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1430 cents. How many 4-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 980 cents. How many 6-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1090 cents. How many 7-cent stamps are there?
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There are 230 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1620 cents. How many 8-cent stamps are there?
There are 130 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1090 cents. How many 8-cent stamps are there?
There are 230 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1920 cents. How many 8-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1140 cents. How many 7-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 730 cents. How many 4-cent stamps are there?
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