490  Leg-Stamp
닭다리 개다리 2

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There are 170 heads of Chickens and Dogs together. Altogether there are 540 legs. How many chickens are there?



There are 170 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?



우리 안에 총 210 마리의 닭과 개가 있다. 다리를 세어보니, 총합쳐서 680 다리가 있다. 몇마리의 닭이 우리 안에 있는가?



There are 150 heads of Chickens and Dogs together. Altogether there are 480 legs. How many chickens are there?



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

There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1080 cents. How many 6-cent stamps are there?



There are 160 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 850 cents. How many 4-cent stamps are there?



오늘 6원짜리 9원짜리 우표 총 210장을 사고, 1590 원을 지불 했을때, 몇개의 6원짜리 우표를 샀는가?



There are 180 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1360 cents. How many 7-cent stamps are there?



There are 140 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 570 cents. How many 3-cent stamps are there?

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