Quantitative Aptitude - Arithmetic Ability Questions

Koushik can do a piece of work in X days and Krishnu can do the same work in Y days. If they work together, then they can do the work in

The point equidistant from the vertices of a triangle is called its

In the following question, select the missing number from the given series.
 
1912, 2012, 2133, 2277, 2446, ?

A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in

In a triangle ABC, AD is angle bisector of ∠A and AB : AC = 3 : 4. If the area of triangle ABC is 350 cm2, then what is the area (in cm2) of triangle ABD?

A and B can do a piece of work in 18 days, B and C in 24 days, A and C in 36 days. Working together they can do the work in

What is the value of (√3 - sec60) ?

What is the area (in sq cm) of a rectangle of perimeter 48 cm and breadth 10 cm?