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There are 140 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 930 cents. How many 7-cent stamps are there?
There are 260 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1300 cents. How many 4-cent stamps are there?
There are 210 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1320 cents. How many 5-cent stamps are there?
There are 200 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 4-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1520 cents. How many 6-cent stamps are there?
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There are 230 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1450 cents. How many 5-cent stamps are there?
There are 250 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 1140 cents. How many 3-cent stamps are there?
오늘 4원짜리 6원짜리 우표 총 220 장을 사고, 1060 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?
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 160 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 840 cents. How many 3-cent stamps are there?
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