Function Machine Mixed Ops Hard — Set 31

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                "rule": "×5",
                "input": 7,
                "output": 35,
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                "correctAnswer": "35",
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                "input": 4,
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                "question": "Input: 4 → [×5] → ?",
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                "correctAnswer": "20",
                "difficulty": "hard"
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            {
                "id": 5,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "+4 ×2",
                "input": 8,
                "output": 24,
                "question": "Input: 8 → [+4 ×2] → ?",
                "answer": 24,
                "correctAnswer": "24",
                "difficulty": "hard"
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                "id": 6,
                "type": "function-machine",
                "subType": "find-rule",
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                "input": 4,
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                "answer": "×2 + 3",
                "correctAnswer": "×2 + 3",
                "difficulty": "hard"
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                "id": 7,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "×2 + 3",
                "input": 6,
                "output": 15,
                "question": "? → [×2 + 3] → 15",
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                "correctAnswer": "6",
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                "id": 8,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "×3",
                "input": 6,
                "output": 18,
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