887  Leg-Stamp
닭다리 개다리 2

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There are 220 heads of Chickens and Dogs together. Altogether there are 640 legs. How many chickens are there?



There are 270 heads of Chickens and Dogs together. Altogether there are 800 legs. How many chickens are there?



우리 안에 총 90 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 280 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 180 heads of Chickens and Dogs together. Altogether there are 520 legs. How many chickens are there?



There are 210 heads of Chickens and Dogs together. Altogether there are 620 legs. How many chickens are there?

There are 250 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1240 cents. How many 4-cent stamps are there?



There are 150 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 770 cents. How many 7-cent stamps are there?



오늘 7원짜리 5원짜리 우표 총 270장을 사고, 1650 원을 지불 했을때, 몇개의 7원짜리 우표를 샀는가?



There are 160 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1090 cents. How many 4-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 900 cents. How many 3-cent stamps are there?

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