There are 170 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 920 cents. How many 7-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1180 cents. How many 6-cent stamps are there?
There are 270 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1750 cents. How many 6-cent stamps are there?
There are 230 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1930 cents. How many 8-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1150 cents. How many 4-cent stamps are there?
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There are 230 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?
There are 250 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1550 cents. How many 7-cent stamps are there?
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There are 190 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1280 cents. How many 6-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1540 cents. How many 7-cent stamps are there?
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