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Weight of animals

Solution

Let :

C : Cat weight

M : Mouse weight

D : Dog weight

Now, using pictures above we have :

C + M = 10       (1)

D + M = 20       (2)

D + C = 24       (3)

(2)(1) :

D + MCM = 20 – 10

DC = 10       (4)

(3)(4) :

D + + D – = 24 + 10

2D = 34

D = 17      (5)

(1)(5) :

C + + D = 27

The weight of all animals is 27 kg

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