There are 220 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1620 cents. How many 6-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1500 cents. How many 7-cent stamps are there?
There are 200 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1180 cents. How many 5-cent stamps are there?
There are 250 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1300 cents. How many 4-cent stamps are there?
There are 160 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1140 cents. How many 6-cent stamps are there?
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There are 130 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 570 cents. How many 3-cent stamps are there?
There are 230 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1770 cents. How many 6-cent stamps are there?
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There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1050 cents. How many 3-cent stamps are there?
There are 240 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1770 cents. How many 6-cent stamps are there?
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