There are 170 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 690 cents. How many 5-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 850 cents. How many 7-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 880 cents. How many 7-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1490 cents. How many 7-cent stamps are there?
There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 6-cent stamps are there?
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There are 140 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 890 cents. How many 6-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1150 cents. How many 7-cent stamps are there?
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There are 170 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1260 cents. How many 6-cent stamps are there?
There are 160 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 930 cents. How many 3-cent stamps are there?
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