B Set 1 Unknown

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        "subject": "arithmetic",
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            {
                "id": 1,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 0.8,
                "operand2": 0.1,
                "question": "0.8 - 0.1 = ?",
                "answer": 0.7,
                "correctAnswer": "0.7",
                "difficulty": "normal"
            },
            {
                "id": 2,
                "type": "decimals",
                "subType": "divide",
                "operand1": 123.2,
                "operand2": 8,
                "question": "123.2 ÷ 8 = ?",
                "answer": 15.4,
                "correctAnswer": "15.4",
                "difficulty": "normal"
            },
            {
                "id": 3,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 7.1,
                "operand2": 7,
                "question": "7.1 × 7 = ?",
                "answer": 49.7,
                "correctAnswer": "49.7",
                "difficulty": "normal"
            },
            {
                "id": 4,
                "type": "decimals",
                "subType": "divide",
                "operand1": 79.8,
                "operand2": 6,
                "question": "79.8 ÷ 6 = ?",
                "answer": 13.3,
                "correctAnswer": "13.3",
                "difficulty": "normal"
            },
            {
                "id": 5,
                "type": "decimals",
                "subType": "divide",
                "operand1": 48.8,
                "operand2": 8,
                "question": "48.8 ÷ 8 = ?",
                "answer": 6.1,
                "correctAnswer": "6.1",
                "difficulty": "normal"
            },
            {
                "id": 6,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 2.6,
                "operand2": 2.4,
                "question": "2.6 - 2.4 = ?",
                "answer": 0.2,
                "correctAnswer": "0.2",
                "difficulty": "normal"
            },
            {
                "id": 7,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 11,
                "operand2": 3.5,
                "question": "11.0 - 3.5 = ?",
                "answer": 7.5,
                "correctAnswer": "7.5",
                "difficulty": "normal"
            },
            {
                "id": 8,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 1.4,
                "operand2": 0.2,
                "question": "1.4 - 0.2 = ?",
                "answer": 1.2,
                "correctAnswer": "1.2",
                "difficulty": "normal"
            },
            {
                "id": 9,
                "type": "decimals",
                "subType": "divide",
                "operand1": 26.4,
                "operand2": 3,
                "question": "26.4 ÷ 3 = ?",
                "answer": 8.8,
                "correctAnswer": "8.8",
                "difficulty": "normal"
            },
            {
                "id": 10,
                "type": "decimals",
                "subType": "divide",
                "operand1": 186.3,
                "operand2": 9,
                "question": "186.3 ÷ 9 = ?",
                "answer": 20.7,
                "correctAnswer": "20.7",
                "difficulty": "normal"
            },
            {
                "id": 11,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 17.9,
                "operand2": 8,
                "question": "17.9 × 8 = ?",
                "answer": 143.2,
                "correctAnswer": "143.2",
                "difficulty": "normal"
            },
            {
                "id": 12,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 14.3,
                "operand2": 6.1,
                "question": "14.3 - 6.1 = ?",
                "answer": 8.2,
                "correctAnswer": "8.2",
                "difficulty": "normal"
            },
            {
                "id": 13,
                "type": "decimals",
                "subType": "add",
                "operand1": 13.8,
                "operand2": 3.6,
                "question": "13.8 + 3.6 = ?",
                "answer": 17.4,
                "correctAnswer": "17.4",
                "difficulty": "normal"
            },
            {
                "id": 14,
                "type": "decimals",
                "subType": "divide",
                "operand1": 24.8,
                "operand2": 4,
                "question": "24.8 ÷ 4 = ?",
                "answer": 6.2,
                "correctAnswer": "6.2",
                "difficulty": "normal"
            },
            {
                "id": 15,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 14.2,
                "operand2": 10.3,
                "question": "14.2 - 10.3 = ?",
                "answer": 3.9,
                "correctAnswer": "3.9",
                "difficulty": "normal"
            },
            {
                "id": 16,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 9.4,
                "operand2": 9.4,
                "question": "9.4 - 9.4 = ?",
                "answer": 0,
                "correctAnswer": "0",
                "difficulty": "normal"
            },
            {
                "id": 17,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 5.2,
                "operand2": 2.7,
                "question": "5.2 - 2.7 = ?",
                "answer": 2.5,
                "correctAnswer": "2.5",
                "difficulty": "normal"
            },
            {
                "id": 18,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 5.4,
                "operand2": 9.4,
                "question": "5.4 × 9.4 = ?",
                "answer": 50.76,
                "correctAnswer": "50.76",
                "difficulty": "normal"
            },
            {
                "id": 19,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 1.8,
                "operand2": 4.2,
                "question": "1.8 × 4.2 = ?",
                "answer": 7.56,
                "correctAnswer": "7.56",
                "difficulty": "normal"
            },
            {
                "id": 20,
                "type": "decimals",
                "subType": "divide",
                "operand1": 34.8,
                "operand2": 3,
                "question": "34.8 ÷ 3 = ?",
                "answer": 11.6,
                "correctAnswer": "11.6",
                "difficulty": "normal"
            }
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