Solution: the animal problem
This is a solution video of the animal problem, which is a famous problem from the literature about bar modelling.
The animal problem goes like this:
A cow weighs 150 kg more than a dog. A goat weighs 130 kg less than a cow. Altogether the three animals weigh 410 kg. What is the weight of the cow.
There also is a document with visual solutions to download here.
It is a well-known task from Bar Model literature, and you can read more about it in this article:
Ng, S.F., & Lee, K. (2009). The model method: Singapore children’s tool for representing and solving algebraic word problems. Journal for Research in Mathematics Education, 40(3), 282-313.
World Class Maths: Asian Teaching Practice
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