621  Leg-Stamp
닭다리 개다리 1

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There are 150 heads of Chickens and Dogs together. Altogether there are 420 legs. How many chickens are there?



There are 130 heads of Chickens and Dogs together. Altogether there are 420 legs. How many chickens are there?



There are 230 heads of Chickens and Dogs together. Altogether there are 680 legs. How many chickens are there?



There are 100 heads of Chickens and Dogs together. Altogether there are 280 legs. How many chickens are there?



There are 140 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?

There are 230 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1440 cents. How many 8-cent stamps are there?



There are 270 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 1370 cents. How many 7-cent stamps are there?



There are 210 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 990 cents. How many 6-cent stamps are there?



There are 180 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 670 cents. How many 4-cent stamps are there?



There are 180 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1020 cents. How many 7-cent stamps are there?

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