B Set 15 Unknown

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                "question": "If left side = 3 × 9, what does the right side equal to balance the scale?",
                "answer": 27,
                "correctAnswer": "27",
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                "id": 2,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 10 × 9, what does the right side equal to balance the scale?",
                "answer": 90,
                "correctAnswer": "90",
                "difficulty": "easy"
            },
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                "id": 3,
                "type": "balance-scale",
                "subType": "missing-addend",
                "question": "Balance the scale: 4 + __ = 5",
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                "id": 5,
                "type": "balance-scale",
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                "question": "Balance the scale: 2 + 8 = 8 + ?",
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                "id": 6,
                "type": "balance-scale",
                "subType": "missing-addend",
                "question": "Balance the scale: 2 + __ = 7",
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                "id": 7,
                "type": "balance-scale",
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                "id": 8,
                "type": "balance-scale",
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                "id": 9,
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                "id": 11,
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                "question": "Balance the scale: 5 + __ = 6",
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                "correctAnswer": "1",
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                "id": 12,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 7 × 9, what does the right side equal to balance the scale?",
                "answer": 63,
                "correctAnswer": "63",
                "difficulty": "easy"
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                "id": 13,
                "type": "balance-scale",
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                "question": "Balance the scale: 8 + 5 = 12 + ?",
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                "id": 14,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 5 × 7, what does the right side equal to balance the scale?",
                "answer": 35,
                "correctAnswer": "35",
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                "id": 15,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 2 × 4, what does the right side equal to balance the scale?",
                "answer": 8,
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                "id": 17,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 4 × 3, what does the right side equal to balance the scale?",
                "answer": 12,
                "correctAnswer": "12",
                "difficulty": "easy"
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                "id": 18,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 9 × 4, what does the right side equal to balance the scale?",
                "answer": 36,
                "correctAnswer": "36",
                "difficulty": "easy"
            },
            {
                "id": 19,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 4 × 10, what does the right side equal to balance the scale?",
                "answer": 40,
                "correctAnswer": "40",
                "difficulty": "easy"
            },
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                "id": 20,
                "type": "balance-scale",
                "subType": "equal-expressions",
                "question": "Balance the scale: 6 + 7 = 12 + ?",
                "answer": 1,
                "correctAnswer": "1",
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