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There are 120 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 800 cents. How many 5-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1230 cents. How many 3-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 810 cents. How many 5-cent stamps are there?
There are 230 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1570 cents. How many 4-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1430 cents. How many 4-cent stamps are there?
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There are 140 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1060 cents. How many 8-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1720 cents. How many 7-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 590 cents. How many 4-cent stamps are there?
There are 220 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1400 cents. How many 6-cent stamps are there?
There are 280 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1810 cents. How many 6-cent stamps are there?
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