Solve animals-and-legs count

Q: Solve animals-and-legs count

This is a Statistics & Math interview question from SIG (Susquehanna) for Data Scientist roles. View the full question and solution on PracHub.

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Question

Barn Legs Puzzle (Linear Equations)

Convert the word problem into a small system of linear equations and solve.

You have a barn with three types of animals, each with a fixed number of legs:

Spiders: 8 legs
Chickens: 2 legs
Cows: 4 legs

Additional relationships:

The number of chickens is twice the number of cows.
The number of spiders is twice the number of chickens.

There are 520 legs in total. How many chickens are in the barn?

Solve animals-and-legs count

Barn Legs Puzzle (Linear Equations)

Solution

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