Answer:
Cat and mouse weigh 10 kg
dog and mouse weigh 20 kg
-> Dog is heavier than cat: 20 – 10 = 10 (kg)
But dog and cat weigh 24 kg
According to the sum of the differences
-> Dog weighs: (24 + 10) : 2 = 17 (kg)
Cat weighs: 24 – 17 = 7 (kg)
Mouse weighs: 10 – 7 = 3 (kg)
So dog, cat and mouse weigh:
17 + 7 + 3 = 27 (kg)
