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There are 200 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1000 cents. How many 4-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1220 cents. How many 7-cent stamps are there?
There are 220 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1340 cents. How many 7-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1380 cents. How many 6-cent stamps are there?
There are 180 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1080 cents. How many 7-cent stamps are there?
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There are 240 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 920 cents. How many 3-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
오늘 5원짜리 4원짜리 우표 총 180 장을 사고, 810 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?
There are 210 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1360 cents. How many 8-cent stamps are there?
There are 120 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 630 cents. How many 4-cent stamps are there?
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