Number Chain Mixed Medium — Set 28

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                        "op": "+",
                        "operand": 5
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                "answer": 17,
                "question": "Number Chain: 5 → +5 → -3 → +3 → +7 → ?",
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                "type": "number-chain",
                "subType": "number-chain",
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                        "op": "+",
                        "operand": 10
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                    {
                        "op": "+",
                        "operand": 8
                    }
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                "answer": 21,
                "question": "Number Chain: 4 → -3 → x3 → +10 → +8 → ?",
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                "type": "number-chain",
                "subType": "number-chain",
                "start": 4,
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                        "op": "+",
                        "operand": 10
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                    {
                        "op": "-",
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                    {
                        "op": "x",
                        "operand": 5
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                    {
                        "op": "+",
                        "operand": 6
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                ],
                "answer": 16,
                "question": "Number Chain: 4 → +10 → -12 → x5 → +6 → ?",
                "difficulty": "medium"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 2,
                "steps": [
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                        "op": "-",
                        "operand": 1
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                    {
                        "op": "x",
                        "operand": 2
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                    {
                        "op": "+",
                        "operand": 10
                    },
                    {
                        "op": "x",
                        "operand": 5
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                "answer": 60,
                "question": "Number Chain: 2 → -1 → x2 → +10 → x5 → ?",
                "difficulty": "medium"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 10,
                "steps": [
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                        "op": "+",
                        "operand": 3
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                    {
                        "op": "-",
                        "operand": 11
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                    {
                        "op": "+",
                        "operand": 10
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                    {
                        "op": "-",
                        "operand": 11
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                ],
                "answer": 1,
                "question": "Number Chain: 10 → +3 → -11 → +10 → -11 → ?",
                "difficulty": "medium"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 9,
                "steps": [
                    {
                        "op": "x",
                        "operand": 3
                    },
                    {
                        "op": "x",
                        "operand": 4
                    },
                    {
                        "op": "-",
                        "operand": 15
                    },
                    {
                        "op": "x",
                        "operand": 4
                    }
                ],
                "answer": 372,
                "question": "Number Chain: 9 → x3 → x4 → -15 → x4 → ?",
                "difficulty": "medium"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 5,
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                        "op": "x",
                        "operand": 5
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                        "op": "x",
                        "operand": 4
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                    {
                        "op": "+",
                        "operand": 8
                    },
                    {
                        "op": "-",
                        "operand": 65
                    }
                ],
                "answer": 43,
                "question": "Number Chain: 5 → x5 → x4 → +8 → -65 → ?",
                "difficulty": "medium"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 3,
                "steps": [
                    {
                        "op": "x",
                        "operand": 4
                    },
                    {
                        "op": "-",
                        "operand": 8
                    },
                    {
                        "op": "+",
                        "operand": 2
                    },
                    {
                        "op": "+",
                        "operand": 3
                    }
                ],
                "answer": 9,
                "question": "Number Chain: 3 → x4 → -8 → +2 → +3 → ?",
                "difficulty": "medium"
            }
        ],
        "layout": {
            "columns": 2,
            "problemsPerPage": 20
        }
    },
    "outputTargets": {
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    "_archetype": "form-exercise",
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