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There are 190 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1210 cents. How many 4-cent stamps are there?
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 180 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 880 cents. How many 6-cent stamps are there?
There are 250 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1390 cents. How many 6-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1200 cents. How many 6-cent stamps are there?
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There are 220 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 760 cents. How many 4-cent stamps are there?
There are 220 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1500 cents. How many 6-cent stamps are there?
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There are 130 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 660 cents. How many 6-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 840 cents. How many 4-cent stamps are there?
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