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There are 200 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1100 cents. How many 7-cent stamps are there?
There are 180 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 830 cents. How many 4-cent stamps are there?
There are 140 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 860 cents. How many 7-cent stamps are there?
There are 220 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1660 cents. How many 8-cent stamps are there?
There are 130 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 450 cents. How many 3-cent stamps are there?
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There are 190 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1320 cents. How many 8-cent stamps are there?
There are 160 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 750 cents. How many 6-cent stamps are there?
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There are 170 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1260 cents. How many 8-cent stamps are there?
There are 240 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1700 cents. How many 6-cent stamps are there?
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