There are 230 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1700 cents. How many 7-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1570 cents. How many 7-cent stamps are there?
There are 220 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1300 cents. How many 7-cent stamps are there?
There are 180 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 780 cents. How many 5-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 640 cents. How many 3-cent stamps are there?
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There are 230 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 970 cents. How many 5-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1230 cents. How many 7-cent stamps are there?
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There are 170 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1420 cents. How many 8-cent stamps are there?
There are 250 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1370 cents. How many 5-cent stamps are there?
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