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Weight of animals
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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 + M – C – M = 20 – 10
D – C = 10 (4)
(3) + (4) :
D + C + D – C = 24 + 10
2D = 34
D = 17 (5)
(1) + (5) :
C + M + D = 27
The weight of all animals is 27 kg
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