249  Leg-Stamp
닭다리 개다리 1

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



There are 140 heads of Chickens and Dogs together. Altogether there are 440 legs. How many chickens are there?



There are 200 heads of Chickens and Dogs together. Altogether there are 640 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 100 heads of Chickens and Dogs together. Altogether there are 320 legs. How many chickens are there?

There are 160 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 780 cents. How many 6-cent stamps are there?



There are 280 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1380 cents. How many 4-cent stamps are there?



There are 220 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1370 cents. How many 5-cent stamps are there?



There are 210 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 990 cents. How many 5-cent stamps are there?



There are 230 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1260 cents. How many 6-cent stamps are there?

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