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There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 840 cents. How many 3-cent stamps are there?
There are 220 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1420 cents. How many 6-cent stamps are there?
There are 140 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 610 cents. How many 4-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1290 cents. How many 3-cent stamps are there?
There are 230 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1390 cents. How many 5-cent stamps are there?
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There are 130 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 820 cents. How many 4-cent stamps are there?
There are 180 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1140 cents. How many 8-cent stamps are there?
오늘 8원짜리 7원짜리 우표 총 220 장을 사고, 1630 원을 지불 했을때, 몇개의 8원짜리 우표를 샀는가?
There are 220 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1180 cents. How many 7-cent stamps are there?
There are 170 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 630 cents. How many 3-cent stamps are there?
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