Quantitative Aptitude - Arithmetic Ability Questions

If Rs. 2,000 is invested at the rate of 20% per annum, compounded half-yearly, then the amount after 18 months will be:

If the edge of a cube is increased by 10%, then what will be the percentage increase in its volume ?

What is the value of (1/√2) Cot 45° + (1/√3) Cosec 60°?

If P = 7 + 4√3 and PQ = 1, then what is the value of 1/P2 + 1/Q2?

The difference between simple interest on a certain sum at the rate of 6% per annum for 5 years and 6 years is 25.8. What is the sum (in Rs)?

P bought an article for Rs. 1600 and sold it at a profit of 10%. What would have been the increase in the profit percent if it was sold for Rs. 1840?

Reflection of the point (2,-4) in the origin is

What is the sum of a3+b3+c3-3abc, when the value of a=4, b=2 and c=-6?