There are 160 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 720 cents. How many 5-cent stamps are there?
There are 270 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1800 cents. How many 8-cent stamps are there?
There are 220 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1300 cents. How many 7-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1450 cents. How many 4-cent stamps are there?
There are 140 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1190 cents. How many 8-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 280 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1510 cents. How many 4-cent stamps are there?
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There are 210 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 920 cents. How many 4-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1120 cents. How many 7-cent stamps are there?
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