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There are 260 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 920 cents. How many 4-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1400 cents. How many 7-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 870 cents. How many 6-cent stamps are there?
There are 150 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 980 cents. How many 7-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 750 cents. How many 6-cent stamps are there?
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There are 170 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1000 cents. How many 4-cent stamps are there?
There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1050 cents. How many 6-cent stamps are there?
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There are 190 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 860 cents. How many 4-cent stamps are there?
There are 130 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 660 cents. How many 6-cent stamps are there?
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