Quantitative Aptitude - Arithmetic Ability Questions

From the top of a 20 m high building, the angle of elevation of the top of a tower is 60° and the angle of depression of it's foot is at 45°, then the height of the tower is (√3=1.732)

Three angles of a quadrilateral are 60°,90°and 100°. Then the fourth angle of the quadrilateral is

Two pipes fill a tank when working individually in 25 and 40 hours, respectively while a third pipe can drain the filled tank in 16 hours. If all the three pipes are turned on at the same time when the tank is empty, how long will it take to fill the tank completely ?

If the volume of a cylinder is 385 cubic cm and height is 10 cm, find its radius?

Atul and Binay together complete a piece of work in 5 days. If Binay alone can complete the same work in 8 days, how many days Atul take to complete the same work alone?

Select the odd letters from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

The point R(a,b) is first reflected in origin to R1 and R1 is reflected in x­axis to (­-4,2). The co-­ordinates of point R are