Four numbers, when arranged in ascending order, are w, x, y and z. The average of the smallest three numbers is 18, while the average of the largest three was 22. What is the range of the data?
Lokesh is taller than Gagan but not shorter than Abhishek. Abhishek and Suresh are of same height. Lokesh is shorter than Lalit. Amongst the boys, who is the tallest?
Raghu's tanker can fill a cistern in 4 hours. After half the cistern is filled, three more similar tankers are opened. What is the total time taken to fillthe cistern completely?