Here's the answer for those who haven't been able to solve it or figure out the weight of negative numbers?

(Rabbit + Cat) + (Rabbit + Dog) + (Dog + Cat) = 2 x (Rabbit + Dog + Cat) = 10 + 20 + 24 = 54.

=> Rabbit + Dog + Cat = 27.

To find the individual values of Rabbit, Dog, and Cat, let’s break down the information we have:

1. We know:

   $$(Rabbit+Cat)+(Rabbit+Dog)+(Dog+Cat)=2\times (Rabbit+Dog+Cat)=54$$

2. So,

   $$Rabbit+Dog+Cat=27$$

We can substitute this value into each pair equation to solve for each animal individually if we have more information. Please let me know if there are any additional details or equations for specific pairs that would allow us to continue solving this.