There are 140 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 940 cents. How many 5-cent stamps are there?
There are 250 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1300 cents. How many 6-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?
There are 210 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1570 cents. How many 7-cent stamps are there?
There are 230 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1240 cents. How many 5-cent stamps are there?
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There are 150 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 970 cents. How many 6-cent stamps are there?
There are 240 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1320 cents. How many 5-cent stamps are there?
There are 140 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 580 cents. How many 5-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1140 cents. How many 4-cent stamps are there?
There are 120 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 630 cents. How many 4-cent stamps are there?
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