B Set 11 Unknown

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                "id": 1,
                "type": "decimals",
                "subType": "add",
                "operand1": 11.5,
                "operand2": 11.2,
                "question": "11.5 + 11.2 = ?",
                "answer": 22.7,
                "correctAnswer": "22.7",
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                "id": 2,
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                "operand2": 1.2,
                "question": "1.7 - 1.2 = ?",
                "answer": 0.5,
                "correctAnswer": "0.5",
                "difficulty": "normal"
            },
            {
                "id": 3,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 18.4,
                "operand2": 1.1,
                "question": "18.4 - 1.1 = ?",
                "answer": 17.3,
                "correctAnswer": "17.3",
                "difficulty": "normal"
            },
            {
                "id": 4,
                "type": "decimals",
                "subType": "divide",
                "operand1": 91.8,
                "operand2": 9,
                "question": "91.8 ÷ 9 = ?",
                "answer": 10.2,
                "correctAnswer": "10.2",
                "difficulty": "normal"
            },
            {
                "id": 5,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 2.5,
                "operand2": 10,
                "question": "2.5 × 10 = ?",
                "answer": 25,
                "correctAnswer": "25",
                "difficulty": "normal"
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            {
                "id": 6,
                "type": "decimals",
                "subType": "add",
                "operand1": 3.6,
                "operand2": 18.5,
                "question": "3.6 + 18.5 = ?",
                "answer": 22.1,
                "correctAnswer": "22.1",
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                "id": 7,
                "type": "decimals",
                "subType": "add",
                "operand1": 2,
                "operand2": 4.7,
                "question": "2.0 + 4.7 = ?",
                "answer": 6.7,
                "correctAnswer": "6.7",
                "difficulty": "normal"
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            {
                "id": 8,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 12.4,
                "operand2": 8.6,
                "question": "12.4 × 8.6 = ?",
                "answer": 106.64,
                "correctAnswer": "106.64",
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                "id": 9,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 6.1,
                "operand2": 6.6,
                "question": "6.1 × 6.6 = ?",
                "answer": 40.26,
                "correctAnswer": "40.26",
                "difficulty": "normal"
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            {
                "id": 10,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 6.6,
                "operand2": 8.6,
                "question": "6.6 × 8.6 = ?",
                "answer": 56.76,
                "correctAnswer": "56.76",
                "difficulty": "normal"
            },
            {
                "id": 11,
                "type": "decimals",
                "subType": "divide",
                "operand1": 28.4,
                "operand2": 4,
                "question": "28.4 ÷ 4 = ?",
                "answer": 7.1,
                "correctAnswer": "7.1",
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                "id": 12,
                "type": "decimals",
                "subType": "add",
                "operand1": 1.6,
                "operand2": 8.9,
                "question": "1.6 + 8.9 = ?",
                "answer": 10.5,
                "correctAnswer": "10.5",
                "difficulty": "normal"
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            {
                "id": 13,
                "type": "decimals",
                "subType": "add",
                "operand1": 18.2,
                "operand2": 19.4,
                "question": "18.2 + 19.4 = ?",
                "answer": 37.6,
                "correctAnswer": "37.6",
                "difficulty": "normal"
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            {
                "id": 14,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 11.3,
                "operand2": 8.8,
                "question": "11.3 × 8.8 = ?",
                "answer": 99.44,
                "correctAnswer": "99.44",
                "difficulty": "normal"
            },
            {
                "id": 15,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 6.8,
                "operand2": 5.5,
                "question": "6.8 - 5.5 = ?",
                "answer": 1.3,
                "correctAnswer": "1.3",
                "difficulty": "normal"
            },
            {
                "id": 16,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 18.2,
                "operand2": 4.3,
                "question": "18.2 × 4.3 = ?",
                "answer": 78.26,
                "correctAnswer": "78.26",
                "difficulty": "normal"
            },
            {
                "id": 17,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 19.4,
                "operand2": 3,
                "question": "19.4 × 3 = ?",
                "answer": 58.2,
                "correctAnswer": "58.2",
                "difficulty": "normal"
            },
            {
                "id": 18,
                "type": "decimals",
                "subType": "add",
                "operand1": 12.4,
                "operand2": 15.6,
                "question": "12.4 + 15.6 = ?",
                "answer": 28,
                "correctAnswer": "28",
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            {
                "id": 19,
                "type": "decimals",
                "subType": "add",
                "operand1": 9.1,
                "operand2": 19,
                "question": "9.1 + 19.0 = ?",
                "answer": 28.1,
                "correctAnswer": "28.1",
                "difficulty": "normal"
            },
            {
                "id": 20,
                "type": "decimals",
                "subType": "add",
                "operand1": 1.3,
                "operand2": 1.8,
                "question": "1.3 + 1.8 = ?",
                "answer": 3.1,
                "correctAnswer": "3.1",
                "difficulty": "normal"
            }
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