231  Stamp
How many stamps? 2

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There are 140 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 700 cents. How many 4-cent stamps are there?



There are 210 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1170 cents. How many 4-cent stamps are there?



There are 170 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 760 cents. How many 5-cent stamps are there?



There are 210 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1760 cents. How many 8-cent stamps are there?



There are 270 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1170 cents. How many 3-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1100 cents. How many 4-cent stamps are there?



There are 200 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1530 cents. How many 6-cent stamps are there?



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There are 230 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?



There are 190 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1060 cents. How many 4-cent stamps are there?



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231    70 100 80 130 150 ( 530 )   140 90 150 130 130 ( 640 )   [[ 1170 ]]