{
    "1": {
        "id": "1",
        "question": "Which number should be written in place of the question mark?\n<image1>",
        "options": [],
        "image": "images/1.jpg",
        "answer": "60",
        "solution": null,
        "level": 2,
        "subject": "arithmetic",
        "response": "To determine the number that should be written in place of the question mark, we need to identify the pattern in the sequence of numbers. The sequence given is: 90, 80, 70, ?, 50, 40, 30, 20.\n\nLet's examine the sequence step by step:\n\n1. The first number is 90.\n2. The second number is 80, which is 10 less than 90.\n3. The third number is 70, which is 10 less than 80.\n4. The fourth number is the one we need to find.\n5. The fifth number is 50, which is 20 less than 70.\n6. The sixth number is 40, which is 30 less than 70.\n7. The seventh number is 30, which is 40 less than 70.\n8. The eighth number is 20, which is 50 less than 70.\n\nFrom this, we can see that each number in the sequence is 10 less than the previous number. Therefore, the fourth number should be 60, which is 10 less than 70.\n\nSo, the number that should be written in place of the question mark is \\boxed{60}."
    },
    "2": {
        "id": "2",
        "question": "Which bike is most expensive?\n<image1>",
        "options": [
            "A",
            "B",
            "C",
            "D",
            "E"
        ],
        "image": "images/2.jpg",
        "answer": "A",
        "solution": null,
        "level": 2,
        "subject": "arithmetic",
        "response": "To determine which bike is the most expensive, we need to compare the prices of the bikes. The prices are given as follows:\n\n- Bike A: 950 Lt\n- Bike B: 590 Lt\n- Bike C: 905 Lt\n- Bike D: 899 Lt\n- Bike E: 509 Lt\n\nWe can see that the price of Bike A is 950 Lt, which is the highest among the given prices. Therefore, the most expensive bike is Bike A.\n\nThe answer is \\boxed{A}."
    },
    "3": {
        "id": "3",
        "question": "Which kite has the longest string?\n<image1>",
        "options": [
            "A",
            "B",
            "C",
            "D",
            "E"
        ],
        "image": "images/3.jpg",
        "answer": "C",
        "solution": null,
        "level": 1,
        "subject": "metric geometry - length",
        "response": "To determine which kite has the longest string, we need to compare the lengths of the strings attached to each kite. The string length can be inferred from the position of the string on the kite. The string is typically longer when it is closer to the bottom of the kite.\n\nLet's analyze each kite:\n\n- Kite A: The string is attached to the bottom of the kite, making it the longest string.\n- Kite B: The string is attached to the middle of the kite, making it a shorter string than Kite A.\n- Kite C: The string is attached to the top of the kite, making it the shortest string.\n- Kite D: The string is attached to the middle of the kite, making it a shorter string than Kite A.\n- Kite E: The string is attached to the bottom of the kite, making it the longest string.\n\nFrom the analysis, we can see that Kite A and Kite E have the longest strings. However, since the problem asks for the kite with the longest string, and both Kite A and Kite E have the same length, we can choose either one. For the sake of this problem, we will choose Kite A.\n\nTherefore, the kite with the longest string is \\boxed{A}."
    },
    "4": {
        "id": "4",
        "question": "How many different digits can you find in this picture?\n<image1>",
        "options": [],
        "image": "images/4.jpg",
        "answer": "6",
        "solution": null,
        "level": 1,
        "subject": "counting",
        "response": "To determine how many different digits can be found in the given picture, we need to carefully examine the image and identify all the distinct digits present. Let's go through the image step by step:\n\n1. **Identify the digits:**\n   - The image shows a character with a head, body, and tail.\n   - The head of the character has a number \"5\" on it.\n   - The body of the character has a number \"3\" on it.\n   - The tail of the character has a number \"2\" on it.\n\n2. **List the digits:**\n   - From the image, we can see the digits \"5\", \"3\", and \"2\".\n\n3. **Count the distinct digits:**\n   - The digits \"5\", \"3\", and \"2\" are all distinct.\n\n4. **Conclusion:**\n   - There are no other digits present in the image.\n\nTherefore, the number of different digits in the picture is \\(\\boxed{3}\\)."
    },
    "5": {
        "id": "5",
        "question": "Which number do you have to write in the last daisy?\n<image1>",
        "options": [],
        "image": "images/5.jpg",
        "answer": "61",
        "solution": null,
        "level": 2,
        "subject": "arithmetic",
        "response": "To solve the problem, we need to follow the sequence of operations step by step. Let's start with the initial number and apply each operation in order.\n\n1. Start with the number 48.\n2. Subtract 20 from 48:\n   \\[\n   48 - 20 = 28\n   \\]\n3. Add 9 to 28:\n   \\[\n   28 + 9 = 37\n   \\]\n4. Subtract 6 from 37:\n   \\[\n   37 - 6 = 31\n   \\]\n5. Add 30 to 31:\n   \\[\n   31 + 30 = 61\n   \\]\n\nSo, the number that should be written in the last daisy is \\(\\boxed{61}\\)."
    }
}