For how many years a land fill cannot be used for constructions of buildings ?

If 900 persons can finish the construction of a building in 40 days, how many persons are needed to complete the construction of building in 25 days.

For how many years have the dinosaurs been extinct ?

The following pie diagram represents expenditure on different items in constructing a building. If the total construction cost of building is Rs540000 answer the following questions: i . Find the central angle for labour expenditure. ii . Find the expenditure on labour.