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There are 240 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1410 cents. How many 7-cent stamps are there?
There are 260 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1560 cents. How many 3-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1040 cents. How many 4-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1140 cents. How many 4-cent stamps are there?
There are 190 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 880 cents. How many 4-cent stamps are there?
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There are 150 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1000 cents. How many 6-cent stamps are there?
There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1530 cents. How many 7-cent stamps are there?
오늘 7원짜리 9원짜리 우표 총 180 장을 사고, 1420 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?
There are 200 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 920 cents. How many 4-cent stamps are there?
There are 210 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1590 cents. How many 7-cent stamps are there?
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