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Math application problem: A chicken and a rabbit live in the same cage, with 30 heads and 94 legs. How many chickens and rabbits are there?
Solution 1: There are X chickens and Y rabbits, and the equations are established.
X+Y=30
2X+4Y=94
X= 13，Y= 17。
Solution 2:
Suppose all 30 heads are chickens, then there are 30*2=60 legs.
The extra 34 legs belong to rabbits, so there are 34/2= 17 rabbits.