551  Stamp
How many stamps? 2

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There are 180 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1120 cents. How many 4-cent stamps are there?



There are 150 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 610 cents. How many 3-cent stamps are there?



There are 200 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 840 cents. How many 6-cent stamps are there?



There are 220 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1240 cents. How many 7-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1530 cents. How many 7-cent stamps are there?



There are 180 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1060 cents. How many 7-cent stamps are there?



There are 140 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 520 cents. How many 3-cent stamps are there?



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There are 270 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?



There are 120 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 760 cents. How many 8-cent stamps are there?



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551    100 70 80 120 70 ( 440 )   80 90 140 150 70 ( 530 )   [[ 970 ]]