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There are 150 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 870 cents. How many 7-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1360 cents. How many 6-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1240 cents. How many 7-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1220 cents. How many 6-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1880 cents. How many 7-cent stamps are there?
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There are 240 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 1090 cents. How many 5-cent stamps are there?
There are 150 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 810 cents. How many 3-cent stamps are there?
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There are 140 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1020 cents. How many 8-cent stamps are there?
There are 150 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1210 cents. How many 7-cent stamps are there?
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