511  Leg-Stamp
닭다리 개다리 2

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There are 110 heads of Chickens and Dogs together. Altogether there are 280 legs. How many chickens are there?



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



우리 안에 총 190 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 540 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 190 heads of Chickens and Dogs together. Altogether there are 500 legs. How many chickens are there?



There are 170 heads of Chickens and Dogs together. Altogether there are 480 legs. How many chickens are there?

There are 230 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1830 cents. How many 7-cent stamps are there?



There are 190 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1220 cents. How many 8-cent stamps are there?



오늘 5원짜리 8원짜리 우표 총 160장을 사고, 980 원을 지불 했을때, 몇개의 5원짜리 우표를 샀는가?



There are 140 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 940 cents. How many 6-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?

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