B Set 21 Unknown

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                "id": 1,
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                "operand2": 0.1,
                "question": "3.5 - 0.1 = ?",
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                "id": 2,
                "type": "decimals",
                "subType": "add",
                "operand1": 16,
                "operand2": 12.2,
                "question": "16.0 + 12.2 = ?",
                "answer": 28.2,
                "correctAnswer": "28.2",
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            },
            {
                "id": 3,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 15.6,
                "operand2": 8.2,
                "question": "15.6 × 8.2 = ?",
                "answer": 127.92,
                "correctAnswer": "127.92",
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            },
            {
                "id": 4,
                "type": "decimals",
                "subType": "add",
                "operand1": 5.4,
                "operand2": 14.9,
                "question": "5.4 + 14.9 = ?",
                "answer": 20.3,
                "correctAnswer": "20.3",
                "difficulty": "normal"
            },
            {
                "id": 5,
                "type": "decimals",
                "subType": "add",
                "operand1": 12.7,
                "operand2": 16.9,
                "question": "12.7 + 16.9 = ?",
                "answer": 29.6,
                "correctAnswer": "29.6",
                "difficulty": "normal"
            },
            {
                "id": 6,
                "type": "decimals",
                "subType": "add",
                "operand1": 1.1,
                "operand2": 10.6,
                "question": "1.1 + 10.6 = ?",
                "answer": 11.7,
                "correctAnswer": "11.7",
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                "id": 7,
                "type": "decimals",
                "subType": "add",
                "operand1": 18.5,
                "operand2": 7.9,
                "question": "18.5 + 7.9 = ?",
                "answer": 26.4,
                "correctAnswer": "26.4",
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                "id": 8,
                "type": "decimals",
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                "operand1": 19.1,
                "operand2": 12.3,
                "question": "19.1 + 12.3 = ?",
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                "correctAnswer": "31.4",
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                "id": 9,
                "type": "decimals",
                "subType": "add",
                "operand1": 16.1,
                "operand2": 12.1,
                "question": "16.1 + 12.1 = ?",
                "answer": 28.2,
                "correctAnswer": "28.2",
                "difficulty": "normal"
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            {
                "id": 10,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 18.1,
                "operand2": 5,
                "question": "18.1 × 5 = ?",
                "answer": 90.5,
                "correctAnswer": "90.5",
                "difficulty": "normal"
            },
            {
                "id": 11,
                "type": "decimals",
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                "operand1": 11.8,
                "operand2": 6.2,
                "question": "11.8 × 6.2 = ?",
                "answer": 73.16,
                "correctAnswer": "73.16",
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                "id": 12,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 11.2,
                "operand2": 1,
                "question": "11.2 - 1.0 = ?",
                "answer": 10.2,
                "correctAnswer": "10.2",
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            {
                "id": 13,
                "type": "decimals",
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                "operand1": 11,
                "operand2": 0.8,
                "question": "11 × 0.8 = ?",
                "answer": 8.8,
                "correctAnswer": "8.8",
                "difficulty": "normal"
            },
            {
                "id": 14,
                "type": "decimals",
                "subType": "divide",
                "operand1": 115.8,
                "operand2": 6,
                "question": "115.8 ÷ 6 = ?",
                "answer": 19.3,
                "correctAnswer": "19.3",
                "difficulty": "normal"
            },
            {
                "id": 15,
                "type": "decimals",
                "subType": "divide",
                "operand1": 137.9,
                "operand2": 7,
                "question": "137.9 ÷ 7 = ?",
                "answer": 19.7,
                "correctAnswer": "19.7",
                "difficulty": "normal"
            },
            {
                "id": 16,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 10.5,
                "operand2": 10.5,
                "question": "10.5 - 10.5 = ?",
                "answer": 0,
                "correctAnswer": "0",
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            },
            {
                "id": 17,
                "type": "decimals",
                "subType": "add",
                "operand1": 17.1,
                "operand2": 10.2,
                "question": "17.1 + 10.2 = ?",
                "answer": 27.3,
                "correctAnswer": "27.3",
                "difficulty": "normal"
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            {
                "id": 18,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 10,
                "operand2": 7.1,
                "question": "10 × 7.1 = ?",
                "answer": 71,
                "correctAnswer": "71",
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            {
                "id": 19,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 7.5,
                "operand2": 4.2,
                "question": "7.5 × 4.2 = ?",
                "answer": 31.5,
                "correctAnswer": "31.5",
                "difficulty": "normal"
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                "id": 20,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 7.3,
                "operand2": 2.9,
                "question": "7.3 × 2.9 = ?",
                "answer": 21.17,
                "correctAnswer": "21.17",
                "difficulty": "normal"
            }
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