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There are 180 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 640 cents. How many 3-cent stamps are there?
There are 180 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 620 cents. How many 4-cent stamps are there?
There are 170 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 950 cents. How many 5-cent stamps are there?
There are 240 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1330 cents. How many 5-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 910 cents. How many 3-cent stamps are there?
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There are 200 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 730 cents. How many 4-cent stamps are there?
There are 200 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 720 cents. How many 3-cent stamps are there?
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There are 250 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1530 cents. How many 3-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 940 cents. How many 7-cent stamps are there?
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