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There are 180 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 810 cents. How many 5-cent stamps are there?
There are 120 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 620 cents. How many 6-cent stamps are there?
There are 180 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1350 cents. How many 8-cent stamps are there?
There are 190 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1080 cents. How many 6-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 880 cents. How many 7-cent stamps are there?
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There are 150 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 960 cents. How many 6-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1500 cents. How many 8-cent stamps are there?
오늘 5원짜리 3원짜리 우표 총 210 장을 사고, 910 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?
There are 190 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1440 cents. How many 6-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1110 cents. How many 6-cent stamps are there?
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