What number should replace the question mark in the figure below?
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Answer for yesterday's Brain Teaser
A Doctor gave 5 pills to a patient and asked him to take one pill after every 45 minutes. What is the minimum time after which, the last pill would have been taken by the patient?
The patient took the first pill at the same moment when doctor gave the pills to him. After that each of remaining 4 pills was taken after every 45 minutes. So, the minimum time after which the last pill was taken by the patient was 45 × 4 = 180 minutes i.e., 3 hours.