131  Stamp
How many stamps? 2

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There are 260 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1490 cents. How many 7-cent stamps are there?



There are 150 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 960 cents. How many 8-cent stamps are there?



There are 200 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 900 cents. How many 4-cent stamps are there?



There are 250 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1480 cents. How many 8-cent stamps are there?



There are 180 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 740 cents. How many 5-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1510 cents. How many 7-cent stamps are there?



There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 3-cent stamps are there?



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There are 180 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 970 cents. How many 6-cent stamps are there?



There are 220 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1410 cents. How many 7-cent stamps are there?



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131    150 90 100 120 100 ( 560 )   90 100 100 70 90 ( 450 )   [[ 1010 ]]