777  Leg-Stamp
닭다리 개다리 2

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There are 240 heads of Chickens and Dogs together. Altogether there are 740 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?



우리 안에 총 160 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 460 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 240 heads of Chickens and Dogs together. Altogether there are 680 legs. How many chickens are there?



There are 220 heads of Chickens and Dogs together. Altogether there are 680 legs. How many chickens are there?

There are 170 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 760 cents. How many 3-cent stamps are there?



There are 220 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1620 cents. How many 5-cent stamps are there?



오늘 5원짜리 3원짜리 우표 총 190장을 사고, 850 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?



There are 190 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1190 cents. How many 5-cent stamps are there?



There are 220 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1340 cents. How many 5-cent stamps are there?

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