501  Leg-Stamp
닭다리 개다리 2

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There are 120 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?



There are 170 heads of Chickens and Dogs together. Altogether there are 580 legs. How many chickens are there?



우리 안에 총 160 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 380 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 130 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?



There are 210 heads of Chickens and Dogs together. Altogether there are 600 legs. How many chickens are there?

There are 260 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1530 cents. How many 8-cent stamps are there?



There are 160 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 580 cents. How many 3-cent stamps are there?



오늘 4원짜리 9원짜리 우표 총 140장을 사고, 810 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?



There are 190 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1130 cents. How many 5-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 3-cent stamps are there?

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