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There are 280 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1530 cents. How many 5-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1150 cents. How many 7-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1200 cents. How many 4-cent stamps are there?
There are 180 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1080 cents. How many 7-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1420 cents. How many 6-cent stamps are there?
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There are 230 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1520 cents. How many 7-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 810 cents. How many 6-cent stamps are there?
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There are 240 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1800 cents. How many 7-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1310 cents. How many 7-cent stamps are there?
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