Quantitative Aptitude - Arithmetic Ability Questions

What is the value of cosecA/√(cosec2A ­- 1)?

A shopkeeper marks the price of an article at Rs. 320. Find the cost price if after allowing a discount of 10%, he still gains 20% on the cost price.

The selling price of an item inclusive of a 16% profit was Rs. 435. What would be the percentage loss if the item was sold for Rs. 330?

A solid cube is cut into 27 identical cubes. What is the percentage increase in the total surface area?

A, B and C can do a job working alone in 12, 16 and 24 days respectively. In how many days they can do the job if they worked together?

In ∆ABC, ∡A + ∡B = 75 and ∡B + ∡C = 140, then ∡B =

∆DEF is right angled at E. If m∠F = 45°, then find the value of (cosecD - 1/√3).

Pipe A can empty a filled tank in 28 hours while Pipe B can fill the same tank, when empty in 35 hrs. If alternatively Pipes A and B are turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?