620  Stamp
How many stamps? 2

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There are 170 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1120 cents. How many 8-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 820 cents. How many 3-cent stamps are there?



There are 170 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 750 cents. How many 4-cent stamps are there?



There are 260 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1140 cents. How many 3-cent stamps are there?



There are 240 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1270 cents. How many 8-cent stamps are there?



There are 280 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1700 cents. How many 7-cent stamps are there?



There are 170 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1260 cents. How many 7-cent stamps are there?



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There are 150 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1150 cents. How many 8-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1780 cents. How many 7-cent stamps are there?



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620    110 90 100 140 110 ( 550 )   150 100 90 100 140 ( 580 )   [[ 1130 ]]