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There are 120 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 550 cents. How many 5-cent stamps are there?
There are 240 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1880 cents. How many 7-cent stamps are there?
There are 200 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1550 cents. How many 8-cent stamps are there?
There are 210 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1150 cents. How many 6-cent stamps are there?
There are 230 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 1050 cents. How many 4-cent stamps are there?
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There are 220 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 880 cents. How many 3-cent stamps are there?
There are 140 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 740 cents. How many 7-cent stamps are there?
오늘 7원짜리 4원짜리 우표 총 230 장을 사고, 1280 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?
There are 170 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 780 cents. How many 4-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1240 cents. How many 7-cent stamps are there?
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