A bag contains coloured marbles. The table shows the probabilities when a marble is chosen at random. Outcome Probability Green 0.1 Pink 0.2 Orange 0.3 Brown 0.4 Aisha takes a marble, records the colour and returns it to the bag. She does this a number of times. In total, she picked an orange marble 27 times. Estimate the total number of marbles Aisha picked from the bag.​