990  Leg-Stamp
닭다리 개다리 2

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There are 170 heads of Chickens and Dogs together. Altogether there are 420 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?



우리 안에 총 200 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 580 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 180 heads of Chickens and Dogs together. Altogether there are 620 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 380 legs. How many chickens are there?

There are 160 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 570 cents. How many 4-cent stamps are there?



There are 250 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1860 cents. How many 7-cent stamps are there?



오늘 3원짜리 7원짜리 우표 총 140장을 사고, 700 원을 지불 했을때, 몇개의 3원짜리 우표를 샀는가?



There are 250 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1350 cents. How many 3-cent stamps are there?



There are 160 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1080 cents. How many 5-cent stamps are there?

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