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There are 220 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1630 cents. How many 8-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 590 cents. How many 4-cent stamps are there?
There are 210 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1100 cents. How many 4-cent stamps are there?
There are 210 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1320 cents. How many 8-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 690 cents. How many 3-cent stamps are there?
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There are 180 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1240 cents. How many 8-cent stamps are there?
There are 150 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 510 cents. How many 3-cent stamps are there?
There are 230 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1540 cents. How many 8-cent stamps are there?
There are 220 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1190 cents. How many 5-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 980 cents. How many 3-cent stamps are there?
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