639  Stamp
How many stamps? 1

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There are 210 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1150 cents. How many 5-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 610 cents. How many 3-cent stamps are there?



There are 130 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 770 cents. How many 4-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 250 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1670 cents. How many 8-cent stamps are there?



There are 150 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 540 cents. How many 4-cent stamps are there?



There are 200 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 870 cents. How many 6-cent stamps are there?



There are 280 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1550 cents. How many 6-cent stamps are there?



There are 280 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1530 cents. How many 5-cent stamps are there?



There are 220 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1640 cents. How many 7-cent stamps are there?



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639    110 70 80 120 140 ( 520 )   90 90 150 150 120 ( 600 )   [[ 1120 ]]