731  Leg-Stamp
닭다리 개다리 2

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There are 210 heads of Chickens and Dogs together. Altogether there are 640 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 420 legs. How many chickens are there?



우리 안에 총 140 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 400 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 210 heads of Chickens and Dogs together. Altogether there are 660 legs. How many chickens are there?



There are 180 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?

There are 240 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?



There are 220 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 1260 cents. How many 3-cent stamps are there?



오늘 3원짜리 7원짜리 우표 총 210장을 사고, 1030 원을 지불 했을때, 몇개의 3원짜리 우표를 샀는가?



There are 180 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 780 cents. How many 4-cent stamps are there?



There are 170 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 580 cents. How many 4-cent stamps are there?

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