There are chickens and rabbits in a cage and the number of rabbits is two times of the number of chickens. They have 210 legs in total.How many rabbit(s) is / are there?

Answer 1

r = number of rabbits with 4 legs each

c = number of chickens with 2 legs each

4r + 2c = 210

r = 2c ⇒ c = r/2

4r + 2(r/2) = 210

5r = 210

r = 42

c = r/2 = 21

Test the solution.