212  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 160 heads of Chickens and Dogs together. Altogether there are 540 legs. How many chickens are there?



우리 안에 총 160 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 400 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 140 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?



There are 220 heads of Chickens and Dogs together. Altogether there are 620 legs. How many chickens 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 210 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1260 cents. How many 7-cent stamps are there?



오늘 7원짜리 6원짜리 우표 총 240장을 사고, 1560 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



There are 220 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1020 cents. How many 3-cent stamps are there?



There are 260 stamps which are 3-cent stamps and 4-cent stamps. Altogether they cost 900 cents. How many 3-cent stamps are there?

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