164  Stamp
How many stamps? 2

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There are 280 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1440 cents. How many 7-cent stamps are there?



There are 220 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1110 cents. How many 3-cent stamps are there?



There are 280 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 1140 cents. How many 5-cent stamps are there?



There are 190 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 3-cent stamps are there?



There are 220 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1650 cents. How many 6-cent stamps are there?

There are 210 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1560 cents. How many 7-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?



오늘 7원짜리 4원짜리 우표 총 210 장을 사고, 1260 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



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 220 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1340 cents. How many 5-cent stamps are there?

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