Hello,Originally Posted bylittlemissgothicsue

let m be the weight of Max;

let f be the weight of Fiffi;

let s be the weight of Sparky.

Now you can translate your sentences into equations:

1.: f+m =72

2.: m + s=86

3.: f + s=35

This is a system of linear equations and there are a lot of ways to solve it.

Never mind which one you use you should come up with this solution:

Greetings

EB