511  Stamp
How many stamps? 2

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There are 230 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1120 cents. How many 6-cent stamps are there?



There are 200 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 840 cents. How many 5-cent stamps are there?



There are 220 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1310 cents. How many 3-cent stamps are there?



There are 220 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1400 cents. How many 8-cent stamps are there?



There are 190 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 680 cents. How many 3-cent stamps are there?



There are 240 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1160 cents. How many 4-cent stamps are there?



There are 150 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 750 cents. How many 3-cent stamps are there?



오늘 5원짜리 4원짜리 우표 총 200 장을 사고, 900 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?



There are 230 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1710 cents. How many 8-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 740 cents. How many 3-cent stamps are there?



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511    100 120 90 130 80 ( 520 )   140 100 100 100 130 ( 570 )   [[ 1090 ]]