642  Stamp
How many stamps? 1

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There are 160 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1040 cents. How many 6-cent stamps are there?



There are 250 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1890 cents. How many 8-cent stamps are there?



There are 130 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 710 cents. How many 7-cent stamps are there?



There are 190 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 750 cents. How many 3-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?



There are 190 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1160 cents. How many 8-cent stamps are there?



There are 230 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1400 cents. How many 8-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 950 cents. How many 3-cent stamps are there?



There are 220 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 730 cents. How many 3-cent stamps are there?



There are 210 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1420 cents. How many 8-cent stamps are there?



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642    80 140 80 100 90 ( 490 )   70 120 130 150 80 ( 550 )   [[ 1040 ]]