[{"id": 1, "type": "multiple_choice", "options": ["x = 76", "x = 20", "x = 19", "x = 18"], "question": "Solve for x: 4x = 76", "correct_answer": "x = 19"}, {"id": 2, "type": "short_answer", "question": "Evaluate: 2 + (-9)", "correct_answer": "-7"}, {"id": 3, "type": "short_answer", "question": "What is 40% of 40?", "correct_answer": "16"}, {"id": 4, "type": "true_false", "question": "The square root of 81 is 9.", "correct_answer": "True"}, {"id": 5, "type": "multiple_choice", "options": ["60 square units", "38 square units", "19 square units", "64 square units"], "question": "What is the area of a rectangle with length 4 and width 15?", "correct_answer": "60 square units"}]