Function Machine Multiplication Hard — Set 80

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                "input": 7,
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                "rule": "×3",
                "input": 9,
                "output": 27,
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                "id": 4,
                "type": "function-machine",
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                "rule": "-3",
                "input": 3,
                "output": 0,
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                "correctAnswer": "3",
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                "id": 6,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "-1",
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                "id": 7,
                "type": "function-machine",
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                "correctAnswer": "5",
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                "id": 8,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "×5",
                "input": 8,
                "output": 40,
                "question": "Input: 8 → [×5] → ?",
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