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There are 140 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 770 cents. How many 7-cent stamps are there?
There are 250 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1440 cents. How many 4-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1050 cents. How many 7-cent stamps are there?
There are 160 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 890 cents. How many 6-cent stamps are there?
There are 270 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 960 cents. How many 4-cent stamps are there?
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There are 260 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1490 cents. How many 7-cent stamps are there?
There are 140 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 770 cents. How many 8-cent stamps are there?
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There are 160 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 810 cents. How many 6-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1100 cents. How many 8-cent stamps are there?
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