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Statistics & Math questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master statistics & math interviews.

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This is a easy difficulty Statistics & Math question, commonly asked during Take-home Project rounds at SIG (Susquehanna).

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This question is commonly asked for Data Scientist candidates at SIG (Susquehanna) during technical interviews.

Solve animals-and-legs count

Last updated: Mar 29, 2026

Quick Overview

This question evaluates a candidate's ability to translate a word problem into a system of linear equations and perform basic algebraic manipulation and arithmetic to determine unknown quantities.

SIG (Susquehanna)

Aug 11, 2025, 12:00 AM

Data Scientist

Take-home Project

Statistics & Math

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?

Solution

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