320  Stamp
How many stamps? 1

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There are 180 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1020 cents. How many 4-cent stamps are there?



There are 160 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 700 cents. How many 4-cent stamps are there?



There are 160 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 750 cents. How many 3-cent stamps are there?



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 260 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1170 cents. How many 3-cent stamps are there?

There are 190 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 780 cents. How many 3-cent stamps are there?



There are 170 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 960 cents. How many 6-cent stamps are there?



There are 220 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1660 cents. How many 7-cent stamps are there?



There are 220 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1280 cents. How many 4-cent stamps are there?



There are 240 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1790 cents. How many 8-cent stamps are there?

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