---
title: They buy 20 lemons at 20p but use only 12. Next time, how many shoul… — The lemonade stand: cost, price, profi… · tree and pragmatics
description: They buy 20 lemons at 20p but use only 12. Next time, how many should they buy to waste none, if they sell the same? Test 10 · ★★ of lesson 31 «The lemonade stand: cost, price, profit and loss» of the money course of Mova's primary school, with the dependency tree and pragmatics of the question and 
---

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# Test 10 · ★★ · The lemonade stand: cost, price, profit and loss

<!-- .ven lang=en -->
They buy 20 lemons at 20p but use only 12. Next time, how many should they buy to waste none, if they sell the same?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 2 · right ✓ · **Who acts:** They, lemons · **What happens:** buy, use, waste, sell · **To what, where:** 20 lemons, 20 p, 12, many, none, same

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This is test 10 · ★★ of lesson 31 «The lemonade stand: cost, price, profit and loss» of the money course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/money/31-the-lemonade-stand-cost-price-profit-and-loss/#t10).

## The question {#question}

<!-- .note -->
*Sentence 1:* They buy 20 lemons at 20p but use only 12.

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:1
# text = They buy 20 lemons at 20p but use only 12.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	buy	buy	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	20	20	NUM	CD	NumForm=Digit|NumType=Card	4	nummod	_	_
4	lemons	lemon	NOUN	NNS	Number=Plur	2	obj	_	_
5	at	at	ADP	IN	_	7	case	_	_
6	20	20	NUM	CD	NumForm=Digit|NumType=Card	7	nummod	_	SpaceAfter=No
7	p	p	NOUN	NN	Number=Sing	2	obl	_	_
8	but	but	CCONJ	CC	_	9	cc	_	_
9	use	use	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
10	only	only	ADV	RB	_	11	advmod	_	_
11	12	12	NUM	CD	NumForm=Digit|NumType=Card	9	obj	_	SpaceAfter=No
12	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **buy** | present | They | 20 lemons |  | 20 p |  |  | vn get-13.5.1 «NP V NP PP.source NP.asset»: agent=Agent lemon=Theme at p=Asset |
| 2 | **use** | present | They *not said here* | 12 |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent 12=Patient |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

<!-- .note -->
*Sentence 2:* Next time, how many should they buy to waste none, if they sell the same?

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:2
# text = Next time, how many should they buy to waste none, if they sell the same?
1	Next	next	ADJ	JJ	Degree=Pos	2	amod	_	_
2	time	time	NOUN	NN	Number=Sing	8	obl:unmarked	_	SpaceAfter=No
3	,	,	PUNCT	,	_	8	punct	_	_
4	how	how	ADV	WRB	PronType=Int	5	advmod	_	_
5	many	many	ADJ	JJ	Degree=Pos	8	obj	_	_
6	should	should	AUX	MD	VerbForm=Fin	8	aux	_	_
7	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	8	nsubj	_	_
8	buy	buy	VERB	VB	VerbForm=Inf	0	root	_	_
9	to	to	PART	TO	_	10	mark	_	_
10	waste	waste	VERB	VB	VerbForm=Inf	8	advcl	_	_
11	none	none	PRON	NN	PronType=Neg	10	obj	_	SpaceAfter=No
12	,	,	PUNCT	,	_	15	punct	_	_
13	if	if	SCONJ	IN	_	15	mark	_	_
14	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	15	nsubj	_	_
15	sell	sell	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	conj	_	_
16	the	the	DET	DT	Definite=Def|PronType=Art	17	det	_	_
17	same	same	ADJ	JJ	Degree=Pos	15	obj	_	SpaceAfter=No
18	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **buy** | should | lemons *= lemon* | many |  |  | time |  | vn accept-77.1 «NP V NP»: agent=Agent many=Theme |
| 2 | **waste** | to-infinitive | lemons *= lemon* *not said here* | none |  |  |  |  | vn destroy-44 «NP V NP»: agent=Agent none=Patient |
| 3 | **sell** *a condition, not said to happen* | present | lemons *= lemon* | the same |  |  |  |  | vn give-13.1-1 «NP V NP»: agent=Agent same=Theme |

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
20

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:o1:1
# text = 20
1	20	20	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 · ← Mova's choice · ✓ the right answer {#o2}

<!-- .ven lang=en -->
12

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:o2:1
# text = 12
1	12	12	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
8

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:o3:1
# text = 8
1	8	8	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
32

```conllu
# sent_id = question:money:31-the-lemonade-stand-cost-price-profit-and-loss:t10:o4:1
# text = 32
1	32	32	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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