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There are 200 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1320 cents. How many 6-cent stamps are there?



There are 180 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1510 cents. How many 8-cent stamps are there?



There are 260 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 2190 cents. How many 8-cent stamps are there?



There are 160 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1080 cents. How many 8-cent stamps are there?



There are 230 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1250 cents. How many 7-cent stamps are there?

There are 160 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 720 cents. How many 5-cent stamps are there?



There are 210 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1210 cents. How many 7-cent stamps are there?



오늘 4원짜리 8원짜리 우표 총 140 장을 사고, 840 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?



There are 200 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1000 cents. How many 6-cent stamps are there?



There are 160 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 860 cents. How many 6-cent stamps are there?

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