831  Stamp
How many stamps? 2

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There are 230 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 790 cents. How many 3-cent stamps are there?



There are 180 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 890 cents. How many 8-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 630 cents. How many 3-cent stamps are there?



There are 260 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1860 cents. How many 8-cent stamps are there?



There are 130 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 730 cents. How many 7-cent stamps are there?



There are 210 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 940 cents. How many 4-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?



오늘 7원짜리 8원짜리 우표 총 190 장을 사고, 1450 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



There are 140 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 650 cents. How many 5-cent stamps are there?



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



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831    130 70 110 150 70 ( 530 )   110 100 70 90 100 ( 470 )   [[ 1000 ]]