Question

if cat+rabbit weights 10 kg, dog +rabbit weights 20 kg and dog +cat weights 24 kg what will be the combined weight of dao+cat+rabbit

Answer 1

let weight of cat be=x
 weight of rabbit= y
  weight of dog = z
ATQ
x+y=10
z+y=20
z+x=24
add all equation
2(x+y+z)=54
x+y+z=27
combined weight of dog +cat+rabbit will be 27 kg

Answer 2

Given that,
c+r=10kg
d+r=20kg
d+c=24kg

so,
c+r+d+r+d+c=10+20+24/2 (as dog,cat and rabbit are given twice)
54/2=27