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There are 240 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1080 cents. How many 3-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1120 cents. How many 7-cent stamps are there?
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 7-cent stamps and 8-cent stamps. Altogether they cost 1690 cents. How many 7-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1130 cents. How many 6-cent stamps are there?
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There are 150 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 930 cents. How many 3-cent stamps are there?
There are 230 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1460 cents. How many 6-cent stamps are there?
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There are 210 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1470 cents. How many 6-cent stamps are there?
There are 180 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1360 cents. How many 7-cent stamps are there?
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