Task: Table-QA (source dataset: TableBench)

Task: 
You are given a table containing structured data and a natural language question referring to the table. Your goal is to analyze the table and provide an accurate and concise answer based on the given data.

Instructions:
1. Understand the Table: Examine the structure, headers, and data in the table. Identify relevant columns and rows related to the question.
2. Interpret the Question: Determine whether the question requires direct retrieval, aggregation, comparison, sorting, filtering, or inference.
3. Extract the Answer: Use logical reasoning and numerical operations (if necessary) to derive the correct response from the table.
4. Format the Answer: No explanation, return the answer in a structured JSON format: {"answer": <answer>}. If the question cannot be answered due to missing or ambiguous data, return a JSON response with {"answer": null}.

Table:
|   Year | R class in service at start of year   |   R1 class in service at start of year |   Quantity withdrawn | Locomotive numbers                       | Notes   |
|-------:|:--------------------------------------|---------------------------------------:|---------------------:|:-----------------------------------------|:--------|
|   1931 | 11                                    |                                     13 |                    1 | 1342                                     | -       |
|   1932 | 10                                    |                                     13 |                    1 | 1077                                     | -       |
|   1934 | 9                                     |                                     13 |                    3 | 1126, 1152, 1338                         | -       |
|   1935 | 6                                     |                                     13 |                    1 | 1153                                     | -       |
|   1937 | 5                                     |                                     13 |                    1 | 1125                                     | -       |
|   1939 | 4                                     |                                     13 |                    1 | 1155                                     | -       |
|   1941 | 3                                     |                                     13 |                    1 | 1336                                     | -       |
|   1942 | 2                                     |                                     13 |                    1 | 1070                                     | -       |
|   1943 | 1                                     |                                     13 |                    1 | 1124                                     | -       |
|   1949 | 0                                     |                                     13 |                    1 | 1127                                     | -       |
|   1955 | —                                     |                                     12 |                    2 | 31154, 31335                             | -       |
|   1958 | —                                     |                                     10 |                    2 | 31069, 31147                             | -       |
|   1959 | —                                     |                                      8 |                    6 | 31010, 31107, 31128, 31174, 31339, 31340 | -       |
|   1960 | —                                     |                                      2 |                    2 | 31047, 31337                             | -       |

Question:
If the R class in service at the start of 1931 was 11, and 1 locomotive was withdrawn, what was the number of R class in service at the end of 1931?


id: 9b632c8dd2d708565ac1d9c18d8753f6
qtype: NumericalReasoning
label: 10