There are 210 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1110 cents. How many 7-cent stamps are there?
There are 150 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 920 cents. How many 4-cent stamps are there?
There are 250 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1600 cents. How many 4-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1240 cents. How many 4-cent stamps are there?
There are 220 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1680 cents. How many 7-cent stamps are there?
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There are 120 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 570 cents. How many 6-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 960 cents. How many 5-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 850 cents. How many 4-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1690 cents. How many 7-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1130 cents. How many 4-cent stamps are there?
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