---
title: Exam 3: heads, and a difference of legs — a lesson of Mova's school · trees and pragmatics
description: «Exam 3: heads, and a difference of legs», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Chickens have 2 legs, rabbits 4.
---

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# Exam 3: heads, and a difference of legs

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Lesson 200 of the lessons course of Mova's primary school: 5 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0).

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- [0](https://md.mova.elamur.ai/free/en/corpora/school/lessons/200-heads-and-a-difference-of-legs/0/) — Chickens have 2 legs, rabbits 4.
- [1](https://md.mova.elamur.ai/free/en/corpora/school/lessons/200-heads-and-a-difference-of-legs/1/) — Suppose all the heads were chickens: the chickens' legs would be ahead by 2 × heads.
- [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/200-heads-and-a-difference-of-legs/2/) — Each time one chicken becomes a rabbit, the chickens lose 2 legs and the rabbits gain 4, so the difference moves by 2 + 4 = 6.
- [3](https://md.mova.elamur.ai/free/en/corpora/school/lessons/200-heads-and-a-difference-of-legs/3/) — 20 heads, and the rabbits' legs are 20 more than the chickens' legs: from 40 behind to 20 ahead is 60, so 60 ÷ 6 = 10 rabbits.
- [4](https://md.mova.elamur.ai/free/en/corpora/school/lessons/200-heads-and-a-difference-of-legs/4/) — Check: 40 legs and 10 chickens with 20 legs.

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