There are 160 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 960 cents. How many 8-cent stamps are there?
There are 270 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 1200 cents. How many 4-cent stamps are there?
There are 160 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1020 cents. How many 3-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1220 cents. How many 4-cent stamps are there?
There are 170 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 3-cent stamps are there?
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There are 170 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 760 cents. How many 5-cent stamps are there?
There are 170 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 710 cents. How many 3-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
There are 260 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1860 cents. How many 8-cent stamps are there?
There are 150 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 890 cents. How many 7-cent stamps are there?
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