B Set 71 Unknown

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                "id": 3,
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                "question": "Balance the scale: 1 + 9 = 3 + ?",
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                "question": "If left side = 6 × 3, what does the right side equal to balance the scale?",
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                "id": 14,
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                "id": 15,
                "type": "balance-scale",
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                "question": "If left side = 8 × 9, what does the right side equal to balance the scale?",
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                "id": 18,
                "type": "balance-scale",
                "subType": "multiplication-balance",
                "question": "If left side = 9 × 10, what does the right side equal to balance the scale?",
                "answer": 90,
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                "type": "balance-scale",
                "subType": "missing-addend",
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                "type": "balance-scale",
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                "question": "Balance the scale: 5 + __ = 8",
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