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There are 140 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 800 cents. How many 5-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1320 cents. How many 5-cent stamps are there?
There are 260 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1410 cents. How many 5-cent stamps are there?
There are 240 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1550 cents. How many 6-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1620 cents. How many 8-cent stamps are there?
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There are 210 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1590 cents. How many 8-cent stamps are there?
There are 160 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1100 cents. How many 8-cent stamps are there?
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There are 180 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1150 cents. How many 6-cent stamps are there?
There are 160 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1030 cents. How many 6-cent stamps are there?
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