Creative Math Problem

Have come across a picture illustrate a simple math problem



There are different method to solve it.

Method 1

Method 2

Method 3

Rabbit + Cat = 10
Rabbit + Dog = 20
Dog + Cat = 24

Rabbit + Cat + Rabbit + Dog = 30
2 Rabbit + Cat + Dog = 30
2 Rabbit + 24 = 30
2 Rabbit = 6
Rabbit = 3
Rabbit + Dog + Cat = 3 + 24 =27.