Cats and birds

There are 15 cats and birds in a park. There are 42 legs altogether. How many cats are there?

Correct answer:

c =  6

Step-by-step explanation:

15=c+b 42=4c+2b  15=c+b 42=4 c+2 b  b+c=15 2b+4c=42  b=9 c=6

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