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There are 190 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 850 cents. How many 5-cent stamps are there?
There are 160 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 850 cents. How many 5-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 740 cents. How many 3-cent stamps are there?
There are 180 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1320 cents. How many 7-cent stamps are there?
There are 170 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 780 cents. How many 5-cent stamps are there?
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There are 250 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1470 cents. How many 5-cent stamps are there?
There are 160 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 620 cents. How many 3-cent stamps are there?
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There are 250 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1400 cents. How many 3-cent stamps are there?
There are 220 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1200 cents. How many 3-cent stamps are there?
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