212  Leg-Stamp
닭다리 개다리 2

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There are 90 heads of Chickens and Dogs together. Altogether there are 280 legs. How many chickens are there?



There are 170 heads of Chickens and Dogs together. Altogether there are 460 legs. How many chickens are there?



우리 안에 총 170 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 540 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 250 heads of Chickens and Dogs together. Altogether there are 760 legs. How many chickens are there?



There are 120 heads of Chickens and Dogs together. Altogether there are 320 legs. How many chickens are there?

There are 180 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1340 cents. How many 7-cent stamps are there?



There are 260 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 1150 cents. How many 4-cent stamps are there?



오늘 3원짜리 4원짜리 우표 총 200장을 사고, 670 원을 지불 했을때, 몇개의 3원짜리 우표를 샀는가?



There are 270 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1880 cents. How many 6-cent stamps are there?



There are 180 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 940 cents. How many 7-cent stamps are there?

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