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There are 260 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1690 cents. How many 7-cent stamps are there?
There are 160 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 760 cents. How many 7-cent stamps are there?
There are 260 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1300 cents. How many 6-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1200 cents. How many 7-cent stamps are there?
There are 220 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 860 cents. How many 3-cent stamps are there?
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There are 140 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 520 cents. How many 3-cent stamps are there?
There are 230 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1210 cents. How many 7-cent stamps are there?
오늘 4원짜리 9원짜리 우표 총 150 장을 사고, 1000 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?
There are 250 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1970 cents. How many 7-cent stamps are there?
There are 170 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1130 cents. How many 5-cent stamps are there?
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