What approximate value should come in place of the question mark(?) in the following question?
105.003+307.993+ 215.630=?

In the adjoining figure ∠AOC=140° where O is the centre of the circle then ∠ ABC is equal to:

In the given figure AB, BC and CA is a tangent of a circle if BC=6.3 cm and MC=2.7 cm then the Value of BL is                                                                

A racing car going at an average speed of 108 km/ hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in km/hr) to complete the lap in 12 minutes?

Find compound interest on Rs. 50000 at 12 % per annum for 6 months, compounded quarterly. 

The ratio 75: 125 in its simplest form is written as: 

A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?