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There are 250 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1400 cents. How many 3-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 900 cents. How many 3-cent stamps are there?



There are 160 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1000 cents. How many 5-cent stamps are there?



There are 250 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 900 cents. How many 4-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1310 cents. How many 4-cent stamps are there?

There are 220 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 3-cent stamps are there?



There are 180 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 780 cents. How many 5-cent stamps are there?



오늘 7원짜리 5원짜리 우표 총 180 장을 사고, 1080 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



There are 190 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1260 cents. How many 6-cent stamps are there?



There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1440 cents. How many 6-cent stamps are there?

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