B Set 64 Unknown

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                "question": "1.8 - 1.0 = ?",
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                "subType": "add",
                "operand1": 3.3,
                "operand2": 18.1,
                "question": "3.3 + 18.1 = ?",
                "answer": 21.4,
                "correctAnswer": "21.4",
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                "type": "decimals",
                "subType": "add",
                "operand1": 0.9,
                "operand2": 11.3,
                "question": "0.9 + 11.3 = ?",
                "answer": 12.2,
                "correctAnswer": "12.2",
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                "id": 5,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 15.5,
                "operand2": 13.2,
                "question": "15.5 - 13.2 = ?",
                "answer": 2.3,
                "correctAnswer": "2.3",
                "difficulty": "normal"
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                "id": 6,
                "type": "decimals",
                "subType": "divide",
                "operand1": 105.7,
                "operand2": 7,
                "question": "105.7 ÷ 7 = ?",
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                "id": 7,
                "type": "decimals",
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                "operand1": 51.1,
                "operand2": 7,
                "question": "51.1 ÷ 7 = ?",
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                "id": 8,
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                "id": 9,
                "type": "decimals",
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                "operand2": 0.8,
                "question": "0.9 - 0.8 = ?",
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                "id": 10,
                "type": "decimals",
                "subType": "subtract",
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                "operand2": 2.7,
                "question": "18.7 - 2.7 = ?",
                "answer": 16,
                "correctAnswer": "16",
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                "id": 11,
                "type": "decimals",
                "subType": "divide",
                "operand1": 90.5,
                "operand2": 5,
                "question": "90.5 ÷ 5 = ?",
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                "id": 12,
                "type": "decimals",
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                "operand1": 3.5,
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                "id": 13,
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                "subType": "divide",
                "operand1": 132,
                "operand2": 10,
                "question": "132.0 ÷ 10 = ?",
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                "id": 14,
                "type": "decimals",
                "subType": "add",
                "operand1": 18.3,
                "operand2": 6.7,
                "question": "18.3 + 6.7 = ?",
                "answer": 25,
                "correctAnswer": "25",
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                "id": 15,
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                "operand1": 15.2,
                "operand2": 7.1,
                "question": "15.2 + 7.1 = ?",
                "answer": 22.3,
                "correctAnswer": "22.3",
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                "id": 16,
                "type": "decimals",
                "subType": "add",
                "operand1": 2.2,
                "operand2": 12.9,
                "question": "2.2 + 12.9 = ?",
                "answer": 15.1,
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                "id": 17,
                "type": "decimals",
                "subType": "divide",
                "operand1": 20.4,
                "operand2": 3,
                "question": "20.4 ÷ 3 = ?",
                "answer": 6.8,
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                "id": 18,
                "type": "decimals",
                "subType": "divide",
                "operand1": 8,
                "operand2": 4,
                "question": "8.0 ÷ 4 = ?",
                "answer": 2,
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                "operand1": 8.5,
                "operand2": 3.5,
                "question": "8.5 - 3.5 = ?",
                "answer": 5,
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                "id": 20,
                "type": "decimals",
                "subType": "divide",
                "operand1": 8.4,
                "operand2": 4,
                "question": "8.4 ÷ 4 = ?",
                "answer": 2.1,
                "correctAnswer": "2.1",
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