hard Set 1 Unknown

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    "title": "form-exercise set 1",
    "operation": "balance-scale",
    "subject": "arithmetic",
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            "rhs": 7,
            "answer": 6,
            "question": "[1 + ?] = 7",
            "correctAnswer": "6"
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            "rhs": 12,
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            "rhs": 9,
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            "question": "[4 + ?] = 9",
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                3,
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            "rhs": 21,
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                10,
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            "rhs": 32,
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            "question": "[8 + 10 + ?] = 32",
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            "rhs": 30,
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            "rhs": 22,
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            "question": "[7 + 1 + ?] = 26",
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                8,
                8,
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            "question": "[8 + 8 + ?] = 26",
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            "rhs": 22,
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            "question": "[?] = 22",
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