255  Leg-Stamp
닭다리 개다리 1

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There are 100 heads of Chickens and Dogs together. Altogether there are 320 legs. How many chickens are there?



There are 130 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?



There are 240 heads of Chickens and Dogs together. Altogether there are 700 legs. How many chickens are there?



There are 120 heads of Chickens and Dogs together. Altogether there are 340 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 200 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 820 cents. How many 5-cent stamps are there?



There are 280 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 2090 cents. How many 7-cent stamps are there?



There are 230 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1680 cents. How many 6-cent stamps are there?



There are 190 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1000 cents. How many 5-cent stamps are there?



There are 230 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 990 cents. How many 5-cent stamps are there?

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