Pigeon Rabbit Pig Math Puzzle with Answer

In this puzzle each objects has a value.
We need to solve the first 3 equations to get the values of Bird, Rabbit and Pig and then solve the fourth equation to get the final answer.
Scroll down to see the answer with detailed explanation.
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ANSWER
105 is the answer.
Explanation
Let the value of Bird = B, Rabbit = R and Pig = P
From Equation 1: B + R = 5
From Equation 2: P – B = 99
From Equation 3: R + R + R = 12
On solving equation 3, we get:
=> 3R = 12
=> R = 12/3
=> R = 4 (So, the value of Rabbit = 4)
On solving equation 1, we get:
=> B + 4 = 5
=> B = 5 – 4
=> B = 1 (So, the value of Bird = 1)
On solving equation 2, we get:
=> P – 1 = 99
=> P = 99 + 1
=> 100 (So, the value of Pig = 100)
Therefore, the fourth equation becomes:
=> 1 + 100 + 4
=> 105