690  Leg-Stamp
닭다리 개다리 2

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



There are 120 heads of Chickens and Dogs together. Altogether there are 300 legs. How many chickens are there?



우리 안에 총 200 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 640 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



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



There are 170 heads of Chickens and Dogs together. Altogether there are 560 legs. How many chickens are there?

There are 260 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 910 cents. How many 4-cent stamps are there?



There are 280 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1570 cents. How many 7-cent stamps are there?



오늘 4원짜리 8원짜리 우표 총 180장을 사고, 1080 원을 지불 했을때, 몇개의 4원짜리 우표를 샀는가?



There are 190 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1100 cents. How many 5-cent stamps are there?



There are 260 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1690 cents. How many 6-cent stamps are there?

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