There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1170 cents. How many 3-cent stamps are there?
There are 130 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 580 cents. How many 4-cent stamps are there?
There are 180 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 960 cents. How many 7-cent stamps are there?
There are 180 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1140 cents. How many 5-cent stamps are there?
There are 170 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1210 cents. How many 5-cent stamps are there?
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There are 200 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 720 cents. How many 3-cent stamps are there?
There are 210 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1030 cents. How many 3-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1130 cents. How many 4-cent stamps are there?
There are 120 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 860 cents. How many 8-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 950 cents. How many 4-cent stamps are there?
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