Question

X, y and z can do a piece of work in 30 days. They all three worked for 4 days and then x left. Y and z continued the work and worked for 20 more days when y left. Z worked for another 80 days and completed the work. In how many days can x alone complete the work if z can complete it in 150 days?

Answer 1

answer is x alone complete work in = 60 days