tidal volume; lung capacity; medicine

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    Finding Total Lung Capacity

    A patient breathes 12 times per minute. Vital capacity : 5 L. Functional residual capacity: 1.4L. Inspiratory reserve volume : 1.2L. What is the total lung capacity of the patient? Weird question. It seems like I have to guess what the tidal volume is. How do you people solve this problem?