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There are 270 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1370 cents. How many 7-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1380 cents. How many 7-cent stamps are there?
There are 260 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 910 cents. How many 3-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1150 cents. How many 7-cent stamps are there?
There are 270 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1590 cents. How many 3-cent stamps are there?
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There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1530 cents. How many 7-cent stamps are there?
There are 260 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 1020 cents. How many 3-cent stamps are there?
There are 190 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1230 cents. How many 5-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1150 cents. How many 5-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1200 cents. How many 7-cent stamps are there?
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