310  Stamp
How many stamps? 2

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There are 170 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 940 cents. How many 5-cent stamps are there?



There are 280 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1830 cents. How many 7-cent stamps are there?



There are 160 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 680 cents. How many 3-cent stamps are there?



There are 160 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 6-cent stamps are there?



There are 200 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1470 cents. How many 8-cent stamps are there?



There are 180 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1360 cents. How many 7-cent stamps are there?



There are 190 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1020 cents. How many 5-cent stamps are there?



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There are 270 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1710 cents. How many 5-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1160 cents. How many 7-cent stamps are there?



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310    80 150 110 110 70 ( 520 )   80 120 80 150 110 ( 540 )   [[ 1060 ]]