581  Stamp
How many stamps? 2

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There are 170 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1310 cents. How many 7-cent stamps are there?



There are 120 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 500 cents. How many 5-cent stamps are there?



There are 150 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 900 cents. How many 5-cent stamps are there?



There are 130 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 800 cents. How many 8-cent stamps are there?



There are 150 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 820 cents. How many 6-cent stamps are there?



There are 180 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1260 cents. How many 8-cent stamps are there?



There are 130 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1100 cents. How many 8-cent stamps are there?



오늘 5원짜리 7원짜리 우표 총 200 장을 사고, 1140 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?



There are 160 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 740 cents. How many 4-cent stamps are there?



There are 170 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1120 cents. How many 8-cent stamps are there?



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581    110 70 100 70 70 ( 420 )   120 70 130 110 90 ( 520 )   [[ 940 ]]