There are 210 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 990 cents. How many 3-cent stamps are there?
There are 160 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1200 cents. How many 8-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1440 cents. How many 8-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1460 cents. How many 6-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1250 cents. How many 7-cent stamps are there?
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There are 180 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 900 cents. How many 7-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 950 cents. How many 4-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1450 cents. How many 7-cent stamps are there?
There are 220 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1520 cents. How many 8-cent stamps are there?
There are 140 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 840 cents. How many 8-cent stamps are there?
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