Anita, Indu and Geeta can do a piece of work in 18 days, 27 days and 36 days respectively. They start working together. After working for 4 days. Anita goes away and Indu leaves 7 days before the work is finishe4⃣ Only Geeta remains at work from beginning to en4⃣ In how many days was the whole work done?