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Let a =cow, b = sheep, c = Fish, d = camel

C+d = 500
So, d = 500 - c
But d - b + c = 455
500 - c - b + c = 455
So , b = 45

a + b = 240
a = 195

a - c = 215
c = 20

d = 500 - c
= 500 - 20
= 480

So the answer is 480

Nice btw, you can check These amazing Questions

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