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There are 220 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 990 cents. How many 4-cent stamps are there?
There are 220 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1260 cents. How many 8-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1460 cents. How many 7-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 820 cents. How many 3-cent stamps are there?
There are 220 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1650 cents. How many 8-cent stamps are there?
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There are 220 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1260 cents. How many 7-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1070 cents. How many 7-cent stamps are there?
There are 270 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2290 cents. How many 8-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1260 cents. How many 3-cent stamps are there?
There are 190 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 860 cents. How many 4-cent stamps are there?
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