B Set 18 Unknown

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                "question": "Simplify 6/15 = ?",
                "answer": "2/5",
                "correctAnswer": "2/5",
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                "id": 2,
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                "numerator1": 5,
                "denominator1": 7,
                "numerator2": 1,
                "denominator2": 2,
                "question": "5/7 - 1/2 = ?",
                "answer": "3/14",
                "correctAnswer": "3/14",
                "difficulty": "normal"
            },
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                "id": 3,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 5,
                "denominator1": 7,
                "numerator2": 4,
                "denominator2": 8,
                "question": "5/7 × 4/8 = ?",
                "answer": "5/14",
                "correctAnswer": "5/14",
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                "id": 4,
                "type": "fractions",
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                "numerator1": 2,
                "denominator1": 4,
                "numerator2": 7,
                "denominator2": 8,
                "question": "2/4 × 7/8 = ?",
                "answer": "7/16",
                "correctAnswer": "7/16",
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                "id": 5,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 6,
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                "numerator2": 3,
                "denominator2": 5,
                "question": "6/7 × 3/5 = ?",
                "answer": "18/35",
                "correctAnswer": "18/35",
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                "id": 6,
                "type": "fractions",
                "subType": "divide",
                "numerator1": 1,
                "denominator1": 3,
                "numerator2": 6,
                "denominator2": 8,
                "question": "1/3 ÷ 6/8 = ?",
                "answer": "4/9",
                "correctAnswer": "4/9",
                "difficulty": "normal"
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            {
                "id": 7,
                "type": "fractions",
                "subType": "divide",
                "numerator1": 2,
                "denominator1": 7,
                "numerator2": 1,
                "denominator2": 7,
                "question": "2/7 ÷ 1/7 = ?",
                "answer": "2",
                "correctAnswer": "2",
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            {
                "id": 8,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 1,
                "denominator1": 4,
                "numerator2": 3,
                "denominator2": 4,
                "question": "1/4 × 3/4 = ?",
                "answer": "3/16",
                "correctAnswer": "3/16",
                "difficulty": "normal"
            },
            {
                "id": 9,
                "type": "fractions",
                "subType": "subtract",
                "numerator1": 4,
                "denominator1": 7,
                "numerator2": 1,
                "denominator2": 5,
                "question": "4/7 - 1/5 = ?",
                "answer": "13/35",
                "correctAnswer": "13/35",
                "difficulty": "normal"
            },
            {
                "id": 10,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 2,
                "denominator1": 8,
                "numerator2": 6,
                "denominator2": 7,
                "question": "2/8 × 6/7 = ?",
                "answer": "3/14",
                "correctAnswer": "3/14",
                "difficulty": "normal"
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            {
                "id": 11,
                "type": "fractions",
                "subType": "add",
                "numerator1": 3,
                "denominator1": 7,
                "numerator2": 1,
                "denominator2": 2,
                "question": "3/7 + 1/2 = ?",
                "answer": "13/14",
                "correctAnswer": "13/14",
                "difficulty": "normal"
            },
            {
                "id": 12,
                "type": "fractions",
                "subType": "add",
                "numerator1": 3,
                "denominator1": 6,
                "numerator2": 1,
                "denominator2": 2,
                "question": "3/6 + 1/2 = ?",
                "answer": "1",
                "correctAnswer": "1",
                "difficulty": "normal"
            },
            {
                "id": 13,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 1,
                "denominator1": 8,
                "numerator2": 1,
                "denominator2": 5,
                "question": "1/8 × 1/5 = ?",
                "answer": "1/40",
                "correctAnswer": "1/40",
                "difficulty": "normal"
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                "id": 14,
                "type": "fractions",
                "subType": "subtract",
                "numerator1": 1,
                "denominator1": 3,
                "numerator2": 1,
                "denominator2": 8,
                "question": "1/3 - 1/8 = ?",
                "answer": "5/24",
                "correctAnswer": "5/24",
                "difficulty": "normal"
            },
            {
                "id": 15,
                "type": "fractions",
                "subType": "subtract",
                "numerator1": 4,
                "denominator1": 5,
                "numerator2": 1,
                "denominator2": 8,
                "question": "4/5 - 1/8 = ?",
                "answer": "27/40",
                "correctAnswer": "27/40",
                "difficulty": "normal"
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                "id": 16,
                "type": "fractions",
                "subType": "simplify",
                "numerator1": 4,
                "denominator1": 8,
                "numerator2": 3,
                "denominator2": 6,
                "question": "Simplify 8/16 = ?",
                "answer": "4/8",
                "correctAnswer": "4/8",
                "difficulty": "normal"
            },
            {
                "id": 17,
                "type": "fractions",
                "subType": "multiply",
                "numerator1": 1,
                "denominator1": 6,
                "numerator2": 5,
                "denominator2": 7,
                "question": "1/6 × 5/7 = ?",
                "answer": "5/42",
                "correctAnswer": "5/42",
                "difficulty": "normal"
            },
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                "id": 18,
                "type": "fractions",
                "subType": "subtract",
                "numerator1": 3,
                "denominator1": 4,
                "numerator2": 1,
                "denominator2": 7,
                "question": "3/4 - 1/7 = ?",
                "answer": "17/28",
                "correctAnswer": "17/28",
                "difficulty": "normal"
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                "id": 19,
                "type": "fractions",
                "subType": "subtract",
                "numerator1": 4,
                "denominator1": 5,
                "numerator2": 3,
                "denominator2": 4,
                "question": "4/5 - 3/4 = ?",
                "answer": "1/20",
                "correctAnswer": "1/20",
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                "id": 20,
                "type": "fractions",
                "subType": "simplify",
                "numerator1": 5,
                "denominator1": 8,
                "numerator2": 2,
                "denominator2": 6,
                "question": "Simplify 10/16 = ?",
                "answer": "5/8",
                "correctAnswer": "5/8",
                "difficulty": "normal"
            }
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