B Set 24 Unknown

This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.

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        "subject": "arithmetic",
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                "operator": "+",
                "question": "30 + 39 = ___",
                "answer": 69
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            {
                "id": 2,
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                "operator": "+",
                "question": "16 + 50 = ___",
                "answer": 66
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            {
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                "operator": "+",
                "question": "43 + 32 = ___",
                "answer": 75
            },
            {
                "id": 4,
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                "operator": "+",
                "question": "33 + 54 = ___",
                "answer": 87
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            {
                "id": 5,
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                "operator": "+",
                "question": "21 + 60 = ___",
                "answer": 81
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            {
                "id": 6,
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                "question": "31 + 4 = ___",
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                "operator": "+",
                "question": "40 + 57 = ___",
                "answer": 97
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                "question": "25 + 4 = ___",
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                    "layout": "picture-equation",
                    "operation": "add",
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                "id": 12,
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                "answer": 76
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            {
                "id": 13,
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                "question": "43 + 41 = ___",
                "answer": 84
            },
            {
                "id": 14,
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                "question": "4 + 13 = ___",
                "answer": 17
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            {
                "id": 15,
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                "question": "46 + 12 = ___",
                "answer": 58
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            {
                "id": 16,
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                "answer": 37
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                "id": 17,
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                "operator": "+",
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                "answer": 93
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                "id": 18,
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            {
                "id": 19,
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                "answer": 78
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            {
                "id": 20,
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                "question": "30 + 7 = ___",
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