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There are 220 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1800 cents. How many 7-cent stamps are there?
There are 240 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1170 cents. How many 3-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 980 cents. How many 4-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1290 cents. How many 3-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1380 cents. How many 7-cent stamps are there?
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There are 180 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1310 cents. How many 7-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1190 cents. How many 3-cent stamps are there?
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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?
There are 190 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 790 cents. How many 3-cent stamps are there?
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