medium Set 3 Unknown

This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.

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    "title": "form-exercise set 3",
    "operation": "balance-scale",
    "subject": "arithmetic",
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                4,
                4,
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            "rhs": 15,
            "answer": 7,
            "question": "[4 + 4 + ?] = 15",
            "correctAnswer": "7"
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            "id": 2,
            "type": "balance-scale",
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                "?"
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            "rhs": 17,
            "answer": 17,
            "question": "[?] = 17",
            "correctAnswer": "17"
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                3,
                7,
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            "rhs": 21,
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            "question": "[3 + 7 + ?] = 21",
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            "rhs": 14,
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            "question": "[1 + ?] = 14",
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            "rhs": 8,
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                1,
                1,
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            "rhs": 5,
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            "question": "[1 + 1 + ?] = 5",
            "correctAnswer": "3"
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            "id": 9,
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            "rhs": 22,
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            "question": "[2 + 2 + ?] = 8",
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                2,
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            "rhs": 12,
            "answer": 12,
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            "id": 15,
            "type": "balance-scale",
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                2,
                "?"
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            "rhs": 4,
            "answer": 2,
            "question": "[2 + ?] = 4",
            "correctAnswer": "2"
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            "id": 16,
            "type": "balance-scale",
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                "?"
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            "rhs": 8,
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            "id": 17,
            "type": "balance-scale",
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                2,
                "?"
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            "rhs": 6,
            "answer": 4,
            "question": "[2 + ?] = 6",
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            "id": 18,
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                7,
                "?"
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            "rhs": 19,
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            "question": "[7 + ?] = 19",
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                2,
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            "rhs": 8,
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            "question": "[2 + 2 + ?] = 8",
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