687  Stamp
How many stamps? 2

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There are 250 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1350 cents. How many 8-cent stamps are there?



There are 190 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1380 cents. How many 6-cent stamps are there?



There are 210 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1000 cents. How many 4-cent stamps are there?



There are 260 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1950 cents. How many 6-cent stamps are there?



There are 260 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1330 cents. How many 3-cent stamps are there?



There are 240 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2010 cents. How many 8-cent stamps are there?



There are 250 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1630 cents. How many 6-cent stamps are there?



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There are 220 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 740 cents. How many 3-cent stamps are there?



There are 210 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 1050 cents. How many 6-cent stamps are there?



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687    120 70 130 130 150 ( 600 )   150 120 140 140 140 ( 690 )   [[ 1290 ]]