B Set 7 Unknown

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                "id": 6,
                "type": "decimals",
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                "type": "decimals",
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                "operand1": 13.2,
                "operand2": 6.2,
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                "operand1": 2.6,
                "operand2": 1.4,
                "question": "2.6 + 1.4 = ?",
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                "answer": 34.2,
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                "type": "decimals",
                "subType": "subtract",
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                "operand2": 2.1,
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