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There are 240 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1720 cents. How many 5-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1170 cents. How many 6-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1220 cents. How many 7-cent stamps are there?
There are 240 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1600 cents. How many 5-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1500 cents. How many 6-cent stamps are there?
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There are 210 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 940 cents. How many 5-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1200 cents. How many 6-cent stamps are there?
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There are 150 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 850 cents. How many 5-cent stamps are there?
There are 230 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1620 cents. How many 6-cent stamps are there?
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