Quantitative Aptitude - Arithmetic Ability Questions

Solve the following : 27 - [38 - {46 - (15 - 13 - 2)}]

Painter A can paint a house in 40 days and Painter B can do it in 60 days. With help of C, they did the job in 20 days only. Then, C alone can do the job in

Sum of four consecutive odd numbers is 208. Find the largest number.

Which instrument is used for viewing the sun?

The marked price of a calculator is Rs 750. It is sold at a discount of 22%. If the cost price of the calculator is Rs 500, then what is the profit (in Rs)?

Two pipes, when working one at a time, can fill a cistern in 3 hhrs and 4 hrs, resp while a third pipe can drain the cistern empty in 8 hrs. All the three pipes were opened together when the cistern was 1/12 full. How long did it take for the cistern to be completely full?

1/4 of 12?

If cosec 240° = x, then the value of x is