667  Leg-Stamp
닭다리 개다리 1

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There are 220 heads of Chickens and Dogs together. Altogether there are 680 legs. How many chickens are there?



There are 140 heads of Chickens and Dogs together. Altogether there are 340 legs. How many chickens are there?



There are 130 heads of Chickens and Dogs together. Altogether there are 380 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 200 heads of Chickens and Dogs together. Altogether there are 620 legs. How many chickens are there?

There are 280 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1790 cents. How many 5-cent stamps are there?



There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1510 cents. How many 7-cent stamps are there?



There are 250 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 1370 cents. How many 5-cent stamps are there?



There are 230 stamps which are 8-cent stamps and 5-cent stamps. Altogether they cost 1570 cents. How many 8-cent stamps are there?



There are 280 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1700 cents. How many 7-cent stamps are there?

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