521  Stamp
How many stamps? 2

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There are 260 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2200 cents. How many 8-cent stamps are there?



There are 230 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1330 cents. How many 5-cent stamps are there?



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



There are 200 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1210 cents. How many 8-cent stamps are there?



There are 160 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 900 cents. How many 6-cent stamps are there?



There are 220 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1100 cents. How many 7-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 720 cents. How many 3-cent stamps are there?



오늘 8원짜리 7원짜리 우표 총 130 장을 사고, 990 원을 지불 했을때, 몇개의 8원짜리 우표를 샀는가?



There are 230 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1690 cents. How many 7-cent stamps are there?



There are 250 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1650 cents. How many 4-cent stamps are there?



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521    140 140 70 70 100 ( 520 )   110 100 80 150 120 ( 560 )   [[ 1080 ]]