389  Stamp
How many stamps? 2

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There are 150 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 780 cents. How many 4-cent stamps are there?



There are 140 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 940 cents. How many 6-cent stamps are there?



There are 160 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 920 cents. How many 4-cent stamps are there?



There are 200 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1730 cents. How many 8-cent stamps are there?



There are 190 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 890 cents. How many 7-cent stamps are there?



There are 230 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1720 cents. How many 7-cent stamps are there?



There are 140 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 630 cents. How many 6-cent stamps are there?



오늘 7원짜리 8원짜리 우표 총 210 장을 사고, 1530 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



There are 230 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 3-cent stamps are there?



There are 280 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 990 cents. How many 4-cent stamps are there?



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389    90 90 90 70 80 ( 420 )   120 70 150 150 150 ( 640 )   [[ 1060 ]]