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There are 120 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 550 cents. How many 5-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1790 cents. How many 7-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1350 cents. How many 8-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1400 cents. How many 6-cent stamps are there?
There are 280 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 2090 cents. How many 7-cent stamps are there?
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There are 270 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1070 cents. How many 7-cent stamps are there?
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There are 280 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1790 cents. How many 5-cent stamps are there?
There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1000 cents. How many 3-cent stamps are there?
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