There are 200 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 800 cents. How many 5-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 960 cents. How many 6-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1100 cents. How many 6-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
There are 140 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 580 cents. How many 5-cent stamps are there?
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There are 170 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 990 cents. How many 5-cent stamps are there?
There are 210 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1230 cents. How many 4-cent stamps are there?
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There are 250 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1510 cents. How many 5-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1040 cents. How many 7-cent stamps are there?
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