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There are 200 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1020 cents. How many 3-cent stamps are there?
There are 140 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 860 cents. How many 4-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1290 cents. How many 7-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 670 cents. How many 3-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1190 cents. How many 7-cent stamps are there?
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There are 180 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 920 cents. How many 6-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 890 cents. How many 5-cent stamps are there?
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There are 200 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1700 cents. How many 8-cent stamps are there?
There are 180 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1240 cents. How many 8-cent stamps are there?
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