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There are 140 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 770 cents. How many 4-cent stamps are there?
There are 250 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1280 cents. How many 6-cent stamps are there?
There are 180 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 820 cents. How many 3-cent stamps are there?
There are 220 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1460 cents. How many 5-cent stamps are there?
There are 200 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1250 cents. How many 6-cent stamps are there?
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There are 200 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1520 cents. How many 5-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 3원짜리 9원짜리 우표 총 180 장을 사고, 900 원을 지불 했을때, 몇개의 3원짜리 우표를 샀는가?
There are 240 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1460 cents. How many 4-cent stamps are there?
There are 190 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 850 cents. How many 3-cent stamps are there?
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