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There are 120 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 630 cents. How many 4-cent stamps are there?
There are 250 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1260 cents. How many 6-cent stamps are there?
There are 240 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1640 cents. How many 5-cent stamps are there?
There are 150 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 680 cents. How many 5-cent stamps are there?
There are 250 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1450 cents. How many 8-cent stamps are there?
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There are 180 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 990 cents. How many 3-cent stamps are there?
There are 230 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 960 cents. How many 3-cent stamps are there?
오늘 4원짜리 9원짜리 우표 총 170 장을 사고, 930 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?
There are 210 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 980 cents. How many 3-cent stamps are there?
There are 130 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 700 cents. How many 5-cent stamps are there?
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