409  Leg-Stamp
닭다리 개다리 1

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There are 90 heads of Chickens and Dogs together. Altogether there are 240 legs. How many chickens are there?



There are 180 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 200 heads of Chickens and Dogs together. Altogether there are 620 legs. How many chickens are there?



There are 190 heads of Chickens and Dogs together. Altogether there are 640 legs. How many chickens are there?

There are 140 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 820 cents. How many 5-cent stamps are there?



There are 170 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1210 cents. How many 5-cent stamps are there?



There are 150 stamps which are 7-cent stamps and 3-cent stamps. Altogether they cost 850 cents. How many 7-cent stamps are there?



There are 220 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1540 cents. How many 5-cent stamps are there?



There are 130 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 760 cents. How many 7-cent stamps are there?

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