There are 160 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1230 cents. How many 6-cent stamps are there?
There are 210 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1200 cents. How many 4-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 590 cents. How many 4-cent stamps are there?
There are 230 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 1040 cents. How many 5-cent stamps are there?
There are 170 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 920 cents. How many 7-cent stamps are there?
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There are 190 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1150 cents. How many 5-cent stamps are there?
There are 240 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1480 cents. How many 7-cent stamps are there?
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There are 140 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 480 cents. How many 3-cent stamps are there?
There are 270 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?
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