B Set 9 Unknown

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                "operand1": 6.2,
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                "question": "4.1 × 0.9 = ?",
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                "id": 17,
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                "operand1": 7.4,
                "operand2": 2,
                "question": "7.4 ÷ 2 = ?",
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                "operand1": 9.2,
                "operand2": 1.2,
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                "id": 20,
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                "subType": "add",
                "operand1": 13,
                "operand2": 6.9,
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