251  Leg-Stamp
닭다리 개다리 1

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There are 150 heads of Chickens and Dogs together. Altogether there are 520 legs. How many chickens are there?



There are 180 heads of Chickens and Dogs together. Altogether there are 600 legs. How many chickens are there?



There are 180 heads of Chickens and Dogs together. Altogether there are 460 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 500 legs. How many chickens are there?



There are 250 heads of Chickens and Dogs together. Altogether there are 720 legs. How many chickens are there?

There are 240 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1810 cents. How many 7-cent stamps are there?



There are 230 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1010 cents. How many 3-cent stamps are there?



There are 260 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1430 cents. How many 4-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1480 cents. How many 7-cent stamps are there?



There are 240 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1580 cents. How many 7-cent stamps are there?

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