There are 160 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1140 cents. How many 6-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1570 cents. How many 8-cent stamps are there?
There are 250 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2100 cents. How many 8-cent stamps are there?
There are 160 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1020 cents. How many 6-cent stamps are there?
There are 230 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1440 cents. How many 8-cent stamps are there?
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There are 220 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1530 cents. How many 6-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1270 cents. How many 8-cent stamps are there?
There are 150 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1070 cents. How many 5-cent stamps are there?
There are 220 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1310 cents. How many 3-cent stamps are there?
There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1080 cents. How many 3-cent stamps are there?
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