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There are 250 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 1130 cents. How many 4-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1040 cents. How many 4-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 830 cents. How many 3-cent stamps are there?
There are 120 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 630 cents. How many 4-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 3-cent stamps are there?
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There are 260 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1260 cents. How many 3-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1140 cents. How many 6-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1120 cents. How many 3-cent stamps are there?
There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 6-cent stamps are there?
There are 280 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1360 cents. How many 3-cent stamps are there?
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