There are 240 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1640 cents. How many 6-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1360 cents. How many 8-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?
There are 150 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1120 cents. How many 8-cent stamps are there?
There are 220 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1200 cents. How many 5-cent stamps are there?
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There are 220 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1580 cents. How many 8-cent stamps are there?
There are 270 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 950 cents. How many 4-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1180 cents. How many 6-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1510 cents. How many 4-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1220 cents. How many 6-cent stamps are there?
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