Here is a set of basic questions producing integer or string outputs. Answer them and format the result precisely with the JSON instructions provided:

Question 0 (Question id: q_jlnGi):
Determine the value of f that satisfies: 14*f + 31 = 115 Respond with an integer.

Question 1 (Question id: q_ySCV):
Solve for q: 260*q - 480 = 560 Respond with an integer.

Question 2 (Question id: q_OtHLH):
Your job is to return the last character of a string as a string. For example, the last char of "hello" is "o". Return the last character of the following string: "and"

Question 3 (Question id: q_16LkX):
Calculate 3 * 5.



Return a JSON with each question id as a key.

Each key’s value must be an object holding an 'answer' field. Additionally, if the task is about counting legs of animals or counting letters in a string, add the task_type field with value 'leg_counting' or 'letter_counting', respectively.
For even integers, nest 'half_answer' and 'double_answer' inside an additional 'additional_answer_info' field in the answer object.
If the question asks for the last character of a string, add an 'original_string' field containing the source string.

Now provide the result JSON using the described format.

{"ground_truth": {"q_jlnGi": {"answer": 6, "additional_answer_info": {"half_answer": 3, "double_answer": 12}}, "q_ySCV": {"answer": 4, "additional_answer_info": {"half_answer": 2, "double_answer": 8}}, "q_OtHLH": {"answer": "d", "original_string": "and"}, "q_16LkX": {"answer": 15}}}