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There are 200 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1000 cents. How many 7-cent stamps are there?
There are 130 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 590 cents. How many 3-cent stamps are there?
There are 200 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1660 cents. How many 7-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 790 cents. How many 3-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1500 cents. How many 6-cent stamps are there?
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There are 170 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1180 cents. How many 4-cent stamps are there?
There are 140 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 820 cents. How many 5-cent stamps are there?
오늘 6원짜리 7원짜리 우표 총 160 장을 사고, 1020 원을 지불 했을때, 몇개의 6원짜리 우표를 샀는가?
There are 190 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1030 cents. How many 4-cent stamps are there?
There are 180 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 6-cent stamps are there?
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