622  Leg-Stamp
닭다리 개다리 1

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



There are 150 heads of Chickens and Dogs together. Altogether there are 380 legs. How many chickens are there?



There are 230 heads of Chickens and Dogs together. Altogether there are 720 legs. How many chickens are there?



There are 200 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 680 legs. How many chickens are there?

There are 220 stamps which are 8-cent stamps and 4-cent stamps. Altogether they cost 1360 cents. How many 8-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1880 cents. How many 7-cent stamps are there?



There are 130 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 570 cents. How many 4-cent stamps are there?



There are 130 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 510 cents. How many 3-cent stamps are there?



There are 170 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1090 cents. How many 8-cent stamps are there?

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