644  Stamp
How many stamps? 1

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There are 240 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1500 cents. How many 3-cent stamps are there?



There are 170 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 5-cent stamps are there?



There are 270 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1680 cents. How many 4-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1200 cents. How many 7-cent stamps are there?



There are 220 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1680 cents. How many 6-cent stamps are there?

There are 200 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 800 cents. How many 5-cent stamps are there?



There are 170 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1120 cents. How many 6-cent stamps are there?



There are 250 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1870 cents. How many 8-cent stamps are there?



There are 210 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1610 cents. How many 7-cent stamps are there?



There are 270 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 2010 cents. How many 7-cent stamps are there?

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