511  Stamp
How many stamps? 1

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There are 220 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1520 cents. How many 8-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 810 cents. How many 3-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1070 cents. How many 7-cent stamps are there?



There are 210 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1420 cents. How many 6-cent stamps are there?



There are 200 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1160 cents. How many 5-cent stamps are there?

There are 230 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1490 cents. How many 7-cent stamps are there?



There are 210 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1490 cents. How many 4-cent stamps are there?



There are 150 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 850 cents. How many 8-cent stamps are there?



There are 210 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1780 cents. How many 8-cent stamps are there?



There are 120 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 790 cents. How many 7-cent stamps are there?

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