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There are 220 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1240 cents. How many 6-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1610 cents. How many 8-cent stamps are there?
There are 280 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2370 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?
There are 180 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1180 cents. How many 7-cent stamps are there?
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There are 190 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1150 cents. How many 5-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1640 cents. How many 8-cent stamps are there?
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There are 210 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 940 cents. How many 4-cent stamps are there?
There are 220 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1830 cents. How many 8-cent stamps are there?
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