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There are 240 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1660 cents. How many 6-cent stamps are there?
There are 180 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1370 cents. How many 8-cent stamps are there?
There are 230 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1470 cents. How many 4-cent stamps are there?
There are 190 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1160 cents. How many 5-cent stamps are there?
There are 170 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1250 cents. How many 5-cent stamps are there?
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There are 150 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 820 cents. How many 5-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1230 cents. How many 7-cent stamps are there?
오늘 3원짜리 4원짜리 우표 총 170 장을 사고, 600 원을 지불 했을때, 몇개의 3원짜리 우표를 샀는가?
There are 120 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 580 cents. How many 4-cent stamps are there?
There are 210 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1410 cents. How many 8-cent stamps are there?
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