321  Leg-Stamp
닭다리 개다리 1

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There are 110 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 540 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 170 heads of Chickens and Dogs together. Altogether there are 420 legs. How many chickens are there?



There are 160 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?

There are 210 stamps which are 7-cent stamps and 8-cent stamps. Altogether they cost 1560 cents. How many 7-cent stamps are there?



There are 230 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1370 cents. How many 7-cent stamps are there?



There are 180 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1520 cents. How many 8-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1350 cents. How many 7-cent stamps are there?



There are 150 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 890 cents. How many 7-cent stamps are there?

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