327  Leg-Stamp
닭다리 개다리 1

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There are 130 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 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?



There are 150 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?



There are 120 heads of Chickens and Dogs together. Altogether there are 400 legs. How many chickens are there?

There are 210 stamps which are 3-cent stamps and 5-cent stamps. Altogether they cost 830 cents. How many 3-cent stamps are there?



There are 250 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1530 cents. How many 7-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 840 cents. How many 4-cent stamps are there?



There are 190 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1600 cents. How many 8-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 720 cents. How many 3-cent stamps are there?

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