There are 190 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 960 cents. How many 4-cent stamps are there?
There are 270 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1880 cents. How many 6-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1450 cents. How many 7-cent stamps are there?
There are 150 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 950 cents. How many 5-cent stamps are there?
There are 220 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 1110 cents. How many 6-cent stamps are there?
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There are 190 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 660 cents. How many 4-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1280 cents. How many 6-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 920 cents. How many 3-cent stamps are there?
There are 270 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1500 cents. How many 7-cent stamps are there?
There are 260 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1640 cents. How many 4-cent stamps are there?
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