686  Stamp
How many stamps? 2

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There are 250 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1400 cents. How many 3-cent stamps are there?



There are 200 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1200 cents. How many 4-cent stamps are there?



There are 230 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1620 cents. How many 6-cent stamps are there?



There are 190 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 6-cent stamps are there?



There are 260 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 910 cents. How many 4-cent stamps are there?



There are 210 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1310 cents. How many 5-cent stamps are there?



There are 270 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1500 cents. How many 7-cent stamps are there?



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There are 180 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 780 cents. How many 6-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1010 cents. How many 3-cent stamps are there?



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686    120 120 150 130 130 ( 650 )   80 140 140 80 70 ( 510 )   [[ 1160 ]]