511  Stamp
How many stamps? 1

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There are 230 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1570 cents. How many 4-cent stamps are there?



There are 230 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1770 cents. How many 6-cent stamps are there?



There are 170 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 990 cents. How many 7-cent stamps are there?



There are 220 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 730 cents. How many 3-cent stamps are there?



There are 190 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 940 cents. How many 4-cent stamps are there?

There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1040 cents. How many 3-cent stamps are there?



There are 150 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 760 cents. How many 6-cent stamps are there?



There are 190 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1230 cents. How many 5-cent stamps are there?



There are 190 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?



There are 230 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1470 cents. How many 6-cent stamps are there?

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