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There are 220 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1560 cents. How many 6-cent stamps are there?
There are 220 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1210 cents. How many 6-cent stamps are there?
There are 130 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 510 cents. How many 3-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1040 cents. How many 6-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 960 cents. How many 7-cent stamps are there?
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There are 160 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 710 cents. How many 4-cent stamps are there?
There are 230 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1560 cents. How many 6-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1220 cents. How many 7-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 970 cents. How many 5-cent stamps are there?
There are 130 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 960 cents. How many 7-cent stamps are there?
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