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There are 150 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 850 cents. How many 3-cent stamps are there?
There are 270 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1730 cents. How many 4-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1230 cents. How many 4-cent stamps are there?
There are 150 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 650 cents. How many 3-cent stamps are there?
There are 220 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 960 cents. How many 5-cent stamps are there?
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There are 210 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 990 cents. How many 3-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 980 cents. How many 4-cent stamps are there?
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There are 160 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1000 cents. How many 4-cent stamps are there?
There are 270 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 930 cents. How many 3-cent stamps are there?
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